Divide-by-zero error when no player starts

[Krzysixxx]

If there aren’t any player starts (at least in an UWMF map), there is a divide-by-zero error in gamemap.cpp, in GameMap::GetPlayerSpawn, line 386:

unsignd int alt = player % playerStarts.CountUsed();

The expected behavior would be to show a proper message and crash (quit?) cleanly.