cknight828

 The error occurs when hover mouse to this blank space. It can be reproduced by creating a character, taking off the watch, and opening character info. It does not...

> ``` > GROUP, PICK ONE > ---FULLY_BLACKLISTED_GROUP, weight 1 > ---NOT_BLACKLISTED_MONSTER, weight 1 > ``` > > Current behavior will be that the not blacklisted monster will always spawn,...

This PR fixes multi spawning monsters like place_monsters of mapgen. Spawning once, like place_monster, works well currently because it doesn't check quantity.

> I think this is still 'double counting' the quantity? If we find a monster inside the for-loop, quantity is decremented. But then we exit the loop and _decrease it...

@RenechCDDA Is there something wrong? I found the same issue in 0.H and want to backport this pr.