Fix `TabBar._update_hover` crash
Fix `TabBar._update_hover` crash

Fixes #57710.

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