Merge pull request #16919 from d-m-u/cleaning_up_import_stuff

Remove empty array associations created via UI from association list
(cherry picked from commit bcc70a2)

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1559475

app/models/dialog_import_validator.rb

@@ -57,7 +57,7 @@ def check_dialog_fields_for_validity(dialog_fields)
 
   def check_dialog_associations_for_validity(dialog_fields)
     associations = {}
-    dialog_fields.each { |df| associations.merge!(df["name"] => df["dialog_field_responders"]) unless df["dialog_field_responders"].nil? }
+    dialog_fields.each { |df| associations.merge!(df["name"] => df["dialog_field_responders"]) if df["dialog_field_responders"].present? }
     unless associations.blank?
       circular_references = @dialog_field_association_validator.circular_references(associations)
       raise DialogFieldAssociationCircularReferenceError, circular_references if circular_references