Issue Summary

When we add 'Field required' validator on a Workflow , for attachment validation, it does not work without the transition screen configuration for that transition.

Steps to Reproduce

1. Add a validator called Field required validator -> select 'Attachment' field for any of the transition in a workflow. For example from 'InProgress' to 'Done'.
2. Save this validator and publish the workflow.
   Note: Do not add any transition screen for this Transition.

Expected Results

• If Attachment is not added during the transition it should return error, and when attachment is added before the transition it should successfully transition.

Actual Results

• Even after adding the attachment , the error keeps popping up 'Transition failed: <error message>"

Workaround

• Workaround is to add a transition screen, for this transition, and then add "Attachment" field to it.
  Also , could not find any documentation that states we need to add the fields to transition screen in order for the validator to work. Official documentation does not mention about this either.
  https://confluence.atlassian.com/adminjiracloud/advanced-workflow-configuration-776636620.html#Advancedworkflowconfiguration-validators