ResultsView not working for 310 d2

[rtholmes]

The backend route for the results view is working for d0 and d1 but not for d2 (and won't work for d3 either). This is because .projectUrl is '' for every student in ResultPayloadInternal.students. I think this is because d2 is running against a d1 repo. We need to deal with this more flexibly.

This would be easy to fix if we could count on every student invoking the bot against some repo for d2 and just using the projectUrl from the execution for the projectUrl param for the student, but since we can't (e.g., because they didn't do it or their students made all the requests), we end up being really stuck here.

Ultimately, the ResultView in the UI is getting an incomplete response from the backend and cannot render it properly. The change that is needed is really straightforward, the projectUrl field cannot be empty for student and has to be set to its correct value. After fighting this for the morning though, it isn't clear the fix itself will be easy (without doing something that would break the view for 210 or past 310 deliverables too).