Add due date criterion to test exceptions

Idea created by ja29127 on Mar 31, 2017

    If a test has the option set to disallow students from starting an exam after a due date/time has passed, setting a test availability for a student with availability dates after that due date/time does not override the due date/time restriction.  As a result, the test availability exception is not an actual exception.


    A due date criterion should be added to the test exceptions options, or at the very least, the test availability exception should take precedence over the due date restriction.

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