Fix: Avoid crash by removing litter from rooms getting edited #798
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Fixes #708 (and a few others probably).
The issue shouldn't happen at all, since people cannot drop litter or vomit inside a room.
However, until issue #147 is fixed, litter can be added just before blue-printing a room. When the user then edits the room, the litter is assumed to be part of the room contents, and the program crashes.