resource/aws_launch_template: Prevent downstream resource errors with unconfigured partition numbers (hashicorp#13239)

Output from acceptance testing:

```
--- PASS: TestAccAWSAutoScalingGroup_ALB_TargetGroups (171.95s)
--- PASS: TestAccAWSAutoScalingGroup_ALB_TargetGroups_ELBCapacity (285.70s)
--- PASS: TestAccAWSAutoScalingGroup_autoGeneratedName (118.21s)
--- PASS: TestAccAWSAutoScalingGroup_basic (289.54s)
--- PASS: TestAccAWSAutoScalingGroup_classicVpcZoneIdentifier (126.69s)
--- PASS: TestAccAWSAutoScalingGroup_emptyAvailabilityZones (78.93s)
--- PASS: TestAccAWSAutoScalingGroup_enablingMetrics (236.84s)
--- PASS: TestAccAWSAutoScalingGroup_initialLifecycleHook (254.46s)
--- PASS: TestAccAWSAutoScalingGroup_launchTemplate (39.84s)
--- PASS: TestAccAWSAutoScalingGroup_LaunchTemplate_IAMInstanceProfile (63.24s)
--- PASS: TestAccAWSAutoScalingGroup_launchTemplate_update (196.20s)
--- PASS: TestAccAWSAutoScalingGroup_launchTempPartitionNum (170.82s)
--- PASS: TestAccAWSAutoScalingGroup_LoadBalancers (693.58s)
--- PASS: TestAccAWSAutoScalingGroup_MaxInstanceLifetime (79.29s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy (49.05s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_InstancesDistribution_OnDemandAllocationStrategy (42.20s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_InstancesDistribution_OnDemandBaseCapacity (106.01s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_InstancesDistribution_OnDemandPercentageAboveBaseCapacity (51.32s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_InstancesDistribution_SpotAllocationStrategy (170.25s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_InstancesDistribution_SpotInstancePools (74.39s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_InstancesDistribution_SpotMaxPrice (49.26s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_LaunchTemplate_LaunchTemplateSpecification_LaunchTemplateName (48.53s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_LaunchTemplate_LaunchTemplateSpecification_Version (68.41s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_LaunchTemplate_Override_InstanceType (73.56s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_LaunchTemplate_Override_WeightedCapacity (142.65s)
--- PASS: TestAccAWSAutoScalingGroup_namePrefix (47.08s)
--- PASS: TestAccAWSAutoScalingGroup_serviceLinkedRoleARN (76.81s)
--- PASS: TestAccAWSAutoScalingGroup_suspendingProcesses (237.62s)
--- PASS: TestAccAWSAutoScalingGroup_tags (199.87s)
--- PASS: TestAccAWSAutoScalingGroup_TargetGroupArns (341.68s)
--- PASS: TestAccAWSAutoScalingGroup_terminationPolicies (114.77s)
--- PASS: TestAccAWSAutoScalingGroup_VpcUpdates (78.67s)
--- PASS: TestAccAWSAutoScalingGroup_WithLoadBalancer (642.03s)
--- PASS: TestAccAWSAutoScalingGroup_WithLoadBalancer_ToTargetGroup (320.77s)
--- PASS: TestAccAWSAutoScalingGroup_withMetrics (70.40s)
--- PASS: TestAccAWSAutoScalingGroup_withPlacementGroup (166.42s)

--- PASS: TestAccAWSLaunchTemplate_associatePublicIPAddress (26.93s)
--- PASS: TestAccAWSLaunchTemplate_basic (7.90s)
--- PASS: TestAccAWSLaunchTemplate_BlockDeviceMappings_EBS (43.93s)
--- PASS: TestAccAWSLaunchTemplate_BlockDeviceMappings_EBS_DeleteOnTermination (70.32s)
--- PASS: TestAccAWSLaunchTemplate_capacityReservation_preference (8.37s)
--- PASS: TestAccAWSLaunchTemplate_capacityReservation_target (10.16s)
--- PASS: TestAccAWSLaunchTemplate_cpuOptions (7.90s)
--- PASS: TestAccAWSLaunchTemplate_creditSpecification_nonBurstable (8.79s)
--- PASS: TestAccAWSLaunchTemplate_creditSpecification_t2 (8.45s)
--- PASS: TestAccAWSLaunchTemplate_creditSpecification_t3 (8.57s)
--- PASS: TestAccAWSLaunchTemplate_data (8.40s)
--- PASS: TestAccAWSLaunchTemplate_description (13.69s)
--- PASS: TestAccAWSLaunchTemplate_disappears (6.42s)
--- PASS: TestAccAWSLaunchTemplate_EbsOptimized (30.29s)
--- PASS: TestAccAWSLaunchTemplate_ElasticInferenceAccelerator (13.65s)
--- PASS: TestAccAWSLaunchTemplate_hibernation (18.80s)
--- PASS: TestAccAWSLaunchTemplate_IamInstanceProfile_EmptyConfigurationBlock (7.20s)
--- PASS: TestAccAWSLaunchTemplate_instanceMarketOptions (51.48s)
--- PASS: TestAccAWSLaunchTemplate_licenseSpecification (8.73s)
--- PASS: TestAccAWSLaunchTemplate_metadataOptions (8.15s)
--- PASS: TestAccAWSLaunchTemplate_networkInterface (12.63s)
--- PASS: TestAccAWSLaunchTemplate_networkInterface_ipv6AddressCount (8.55s)
--- PASS: TestAccAWSLaunchTemplate_networkInterface_ipv6Addresses (9.18s)
--- PASS: TestAccAWSLaunchTemplate_networkInterfaceAddresses (12.71s)
--- PASS: TestAccAWSLaunchTemplate_placement_partitionNum (14.94s)
--- PASS: TestAccAWSLaunchTemplate_tags (13.82s)
--- PASS: TestAccAWSLaunchTemplate_update (47.24s)

--- PASS: TestAccAWSLaunchTemplateDataSource_associatePublicIPAddress (26.16s)
--- PASS: TestAccAWSLaunchTemplateDataSource_basic (13.70s)
--- PASS: TestAccAWSLaunchTemplateDataSource_filter_basic (13.86s)
--- PASS: TestAccAWSLaunchTemplateDataSource_filter_tags (13.62s)
--- PASS: TestAccAWSLaunchTemplateDataSource_metadataOptions (13.55s)
```

Author: DrFaust92

aws/resource_aws_autoscaling_group_test.go

@@ -2061,6 +2061,41 @@ func TestAccAWSAutoScalingGroup_MixedInstancesPolicy_LaunchTemplate_Override_Wei
 	})
 }
 
+func TestAccAWSAutoScalingGroup_launchTempPartitionNum(t *testing.T) {
+	var group autoscaling.Group
+
+	randName := fmt.Sprintf("terraform-test-%s", acctest.RandString(10))
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:            func() { testAccPreCheck(t) },
+		Providers:           testAccProviders,
+		CheckDestroy:        testAccCheckAWSAutoScalingGroupDestroy,
+		DisableBinaryDriver: true,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAWSAutoScalingGroupPartitionConfig(randName),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckAWSAutoScalingGroupExists("aws_autoscaling_group.test", &group),
+				),
+			},
+			{
+				ResourceName:      "aws_autoscaling_group.test",
+				ImportState:       true,
+				ImportStateVerify: true,
+				ImportStateVerifyIgnore: []string{
+					"force_delete",
+					"initial_lifecycle_hook",
+					"name_prefix",
+					"tag",
+					"tags",
+					"wait_for_capacity_timeout",
+					"wait_for_elb_capacity",
+				},
+			},
+		},
+	})
+}
+
 const testAccAWSAutoScalingGroupConfig_autoGeneratedName = `
 data "aws_ami" "test_ami" {
   most_recent = true
@@ -4035,3 +4070,56 @@ resource "aws_autoscaling_group" "test" {
 }
 `, rName)
 }
+
+func testAccAWSAutoScalingGroupPartitionConfig(rName string) string {
+	return fmt.Sprintf(`
+data "aws_availability_zones" "available" {
+  # t2.micro is not supported in us-west-2d
+  blacklisted_zone_ids = ["usw2-az4"]
+  state                = "available"
+
+  filter {
+    name   = "opt-in-status"
+    values = ["opt-in-not-required"]
+  }
+}
+
+data "aws_ami" "test_ami" {
+  most_recent = true
+  owners      = ["amazon"]
+
+  filter {
+    name   = "name"
+    values = ["amzn-ami-hvm-*-x86_64-gp2"]
+  }
+}
+
+resource "aws_launch_template" "this" {
+  name          = %[1]q
+  image_id      = data.aws_ami.test_ami.id
+  instance_type = "m5.large"
+
+  placement {
+    tenancy    = "default"
+    group_name = aws_placement_group.test.id
+  }
+}
+
+resource "aws_placement_group" "test" {
+  name     = %[1]q
+  strategy = "cluster"
+}
+
+resource "aws_autoscaling_group" "test" {
+  name_prefix        = "test"
+  availability_zones = ["${data.aws_availability_zones.available.names[0]}"]
+  min_size           = 0
+  max_size           = 0
+
+  launch_template {
+    id      = aws_launch_template.this.id
+    version = "$Latest"
+  }
+}
+`, rName)
+}

aws/resource_aws_launch_template.go

@@ -1706,7 +1706,7 @@ func readPlacementFromConfig(p map[string]interface{}) *ec2.LaunchTemplatePlacem
 		placement.Tenancy = aws.String(v)
 	}
 
-	if v, ok := p["partition_number"].(int); ok {
+	if v, ok := p["partition_number"].(int); ok && v != 0 {
 		placement.PartitionNumber = aws.Int64(int64(v))
 	}