[FAB-9983] fixing endpointconfig channels

-Handling condition where no channel config
found for given channel ID.
-Changes needed from abondoned code push
related to FAB-10001

Change-Id: If74e8c05e60363ddcda686e91b03def60cce05d7
Signed-off-by: Sudesh Shetty <sudesh.shetty@securekey.com>

Author: sudeshrshetty

pkg/fab/channel/transactor.go

@@ -117,6 +117,10 @@ func orderersFromChannel(ctx context.Client, channelID string) ([]fab.Orderer, e
 
 	chNetworkConfig, err := ctx.EndpointConfig().ChannelConfig(channelID)
 	if err != nil {
+		s, ok := status.FromError(err)
+		if ok && s.Code == status.NoMatchingChannelEntity.ToInt32() {
+			return []fab.Orderer{}, nil
+		}
 		return nil, errors.WithMessage(err, "failed to get channel network config")
 	}
 

pkg/fab/channel/transactor_test.go

@@ -130,6 +130,18 @@ func TestOrderersFromChannelCfg(t *testing.T) {
 	assert.NotEmpty(t, o)
 }
 
+// TestOrderersFromChannel - tests scenario where err should not be returned if channel config is not found
+//instead, empty orderers list should be returned
+func TestOrderersFromChannel(t *testing.T) {
+	user := mspmocks.NewMockSigningIdentity("test", "test")
+	ctx := mocks.NewMockContext(user)
+
+	o, err := orderersFromChannel(ctx, "invalid-channel-id")
+	assert.Nil(t, err)
+	assert.NotNil(t, o)
+	assert.Zero(t, len(o))
+}
+
 // TestOrderersFromChannelCfg uses an orderer that does not exist in the configuration.
 func TestOrderersFromChannelCfgBadTLS(t *testing.T) {
 	user := mspmocks.NewMockSigningIdentity("test", "test")