Fix crash when using TileMap::fix_invalid_tiles
Fix crash when using TileMap::fix_invalid_tiles

sanikoyes/godot,Faless/godot,vnen/godot,firefly2442/godot,pkowal1982/godot,pkowal1982/godot,honix/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,firefly2442/godot,DmitriySalnikov/godot,BastiaanOlij/godot,akien-mga/godot,vkbsb/godot,josempans/godot,firefly2442/godot,Shockblast/godot,Shockblast/godot,vnen/godot,Valentactive/godot,vnen/godot,guilhermefelipecgs/godot,Zylann/godot,Valentactive/godot,honix/godot,pkowal1982/godot,josempans/godot,ZuBsPaCe/godot,josempans/godot,godotengine/godot,vkbsb/godot,sanikoyes/godot,Faless/godot,akien-mga/godot,ZuBsPaCe/godot,Valentactive/godot,pkowal1982/godot,firefly2442/godot,akien-mga/godot,pkowal1982/godot,godotengine/godot,pkowal1982/godot,Zylann/godot,akien-mga/godot,vnen/godot,ZuBsPaCe/godot,firefly2442/godot,Faless/godot,firefly2442/godot,sanikoyes/godot,BastiaanOlij/godot,Shockblast/godot,vkbsb/godot,josempans/godot,josempans/godot,Valentactive/godot,DmitriySalnikov/godot,akien-mga/godot,Zylann/godot,guilhermefelipecgs/godot,DmitriySalnikov/godot,BastiaanOlij/godot,vnen/godot,ZuBsPaCe/godot,DmitriySalnikov/godot,honix/godot,firefly2442/godot,DmitriySalnikov/godot,sanikoyes/godot,guilhermefelipecgs/godot,akien-mga/godot,honix/godot,vkbsb/godot,godotengine/godot,BastiaanOlij/godot,sanikoyes/godot,honix/godot,Zylann/godot,Zylann/godot,guilhermefelipecgs/godot,vkbsb/godot,vkbsb/godot,Valentactive/godot,ZuBsPaCe/godot,godotengine/godot,vkbsb/godot,pkowal1982/godot,sanikoyes/godot,pkowal1982/godot,godotengine/godot,vnen/godot,Faless/godot,guilhermefelipecgs/godot,godotengine/godot,Zylann/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,akien-mga/godot,vkbsb/godot,Faless/godot,Valentactive/godot,Shockblast/godot,sanikoyes/godot,Valentactive/godot,Shockblast/godot,Valentactive/godot,BastiaanOlij/godot,josempans/godot,ZuBsPaCe/godot,firefly2442/godot,Zylann/godot,BastiaanOlij/godot,Zylann/godot,sanikoyes/godot,Shockblast/godot,godotengine/godot,Shockblast/godot,vnen/godot,Faless/godot,DmitriySalnikov/godot,godotengine/godot,josempans/godot,akien-mga/godot,Faless/godot,Faless/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,vnen/godot,honix/godot,BastiaanOlij/godot,Shockblast/godot,josempans/godot