Fix reports of already suspended accounts being recorded (mastodon#16047)

Author: Gargron

app/lib/activitypub/activity/flag.rb

@@ -10,6 +10,8 @@ def perform
     target_accounts.each do |target_account|
       target_statuses = target_statuses_by_account[target_account.id]
 
+      next if target_account.suspended?
+
       ReportService.new.call(
         @account,
         target_account,

app/services/report_service.rb

@@ -10,6 +10,8 @@ def call(source_account, target_account, options = {})
     @comment        = options.delete(:comment) || ''
     @options        = options
 
+    raise ActiveRecord::RecordNotFound if @target_account.suspended?
+
     create_report!
     notify_staff!
     forward_to_origin! if !@target_account.local? && ActiveModel::Type::Boolean.new.cast(@options[:forward])