Issue Description:
When a user edits an existing deadline description and saves the changes, the application throws a DeadlineDoesNotExist error.
Expected Behavior:
When a user edits and saves a deadline description, the correct deadline should be submitted, the existing deadline should be found successfully, and the updated description should be saved without throwing a DeadlineDoesNotExist error.
UI:
Issue Description:
When a user edits an existing deadline description and saves the changes, the application throws a DeadlineDoesNotExist error.
Expected Behavior:
When a user edits and saves a deadline description, the correct deadline should be submitted, the existing deadline should be found successfully, and the updated description should be saved without throwing a DeadlineDoesNotExist error.
UI:
