I've found a problem in assigments checking groups allowed to grade.
I don't know how to reproduce this in nightly servers, but the problem is because of the filter:
This line is getting groups of assignment in format:
But then this line:
Is using g.getId() that is only: 790a21a1-10a5-4c95-b28d-8ebcc0fc284d
to filter, so the collection is always empty.
I guess g.getId() should be g.getReference()