Allocation statistics should distinguish unassigned users who have voted from those who haven't

[Dagefoerde]

The page behind "Show allocation statistics" displays a count of students who have not been assigned to a choice. It does not distinguish those that weren't assigned because they have not voted from those who couldn't be assigned even though they have.

This is important in scenarios where we expect only a part of the class to vote, but where choices have a limited number of seats, because it will help decide whether everything is fine or more choices need to be added.

(For reference, the page behind "Show allocation overview" displays exactly the group of people that I need, but there you have to count manually.)

[tobiasreischmann]

This gets even more interesting, if a participant for instance rated two choices out of 10 in the order strategy. But exactly those two choices were deactivated later on.