In certain situations, learners in the nonpassing state (or sometimes
students who have finished a course too early and passed) were getting
information about their grad and certificate status before they were
supposed too.
This adds some data to the courseware api that will allow us to mirror
availability states for certifictes of passing learners withour
revealing information through the api. Now, no matter the status of the
students grade or certificate display behavior, a student should not see
information about certificates early.
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