Resolve "Requests for deleted assignments break history page"

What does this mr do?

Read #699 (closed)

Actions taken to fix bug

Does this MR meet the acceptance criteria?

Screenshots

Deleted Assignments

Deleted Modules

• I have added a changelog entry to reflect the significant changes I made and the bug I fixed.
• A test was created to test the bug.
• I have updated the documentation accordingly.
• I adhere to the style guide.

Closes #699 (closed)