Empty required field causes portal share error "Failed to update request participants field"

Experienced behavior:

• Attempt to share in portal fails. "Failed to update request participants field, errors:"
  • This error quickly disappears in some versions due to page automatically refreshing. (JSDSERVER-5516)
• Agent is able to modify Request Participant field without errors
• Issue has a required field that is empty
  • Tested with description, approvers, and new multi line text custom field

Steps to reproduce:

1. Create sample project
2. Edit an issue to make description empty
3. Mark description field as required in the sample project's field configuration scheme
4. Attempt to share the issue through the portal
5. Error appears: "Failed to update request participants field, errors:"
   • Error may quickly go away due to automatic refresh (JSDSERVER-5516). Test in 3.5.2 to see error without refresh

Example use case where this is a blocker:

1. Request exists, approver field required but empty. Agent asks customer who the approver should be.
2. Customer attempts to share request with colleague so they can get help determining who approver should be, or sharing with potential approver to get confirmation prior to responding to agent