Cause: Occasionally the group information could be None when the call to the Negotiator was made, the cumin code in place was not able to handle that.
Consequence: Stack trace on screen
Fix: The fix was a natural fallout of switching to the non-flash-based charting. The new mechanism has a try/except block that would log an error if this condition ever came up again, but should not show a stack trace on screen.
Result: Quota editing should be free of stack traces on screen again.