Fix debug message and crash in debug mapgen preview #36342
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ZhilkinSerg
added
<Bugfix>
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Summary
SUMMARY: None
Purpose of change
When scrolling through the overmap terrain list in the mapgen preview mode, a debug message "submap already exists" shows and the game crashes after ignoring the message. This fixes the crash.
Describe the solution
Reset submap pointers to nullptr after deleting the submaps in
editmap::cleartmpmap, so the mapgen code doesn't think the submaps still exist.Testing
No crash occurs after the fix.