Fixes for MultipleChoiceOption and FeedbackOption API

Ghost Userrequested to merge
fix/delete-feedback-mco into develop

This merge request fixes two things:

  1. Deleting a FeedbackOption will now throw an error if it is coupled to a MultipleChoiceOption
  2. Inserting a MultipleChoiceOption will now check the problem_id parameter to see if an actual Problem with the specified problem_id exists.

Fixes #51 (closed) and #55 (closed)

Note: It might be useful to merge !16 (merged) first, since I can write test code for this MR.

Edited by Ghost User

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