Fix crash in TileMap::update_cell_bitmask
Fix crash in TileMap::update_cell_bitmask

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