Issue assignment logic broken during prepublication

[joemull]

Describe the bug If you assign or unassign issues during prepublication, only the Issue knows about your changes, not the Article. As a result you may get strange results.

Janeway version 1.4.2

Expected behavior The assignment modal should remember the primary_issue attribute of Article and update it accordingly. This logic should happen in logic.handle_assign_issue and logic.handle_unassign_issue.

Screenshots