Fix sporadic crash on worldmap select

SuperTux / supertux

SuperTux source code

https://supertux.org

GNU General Public License v3.0

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Closed Brockengespenst closed 2 months ago

Brockengespenst commented 2 months ago

Fixes nullptr dereferencing when a new WorldMap has been allocated, but no sector has been setup yet

Fixes #2920