Fix crash when executing `TubeTrailMesh.get_faces()` with GLES3
Fix crash when executing `TubeTrailMesh.get_faces()` with GLES3

Shockblast/godot,vkbsb/godot,pkowal1982/godot,sanikoyes/godot,godotengine/godot,ZuBsPaCe/godot,sanikoyes/godot,pkowal1982/godot,BastiaanOlij/godot,vkbsb/godot,BastiaanOlij/godot,sanikoyes/godot,guilhermefelipecgs/godot,godotengine/godot,BastiaanOlij/godot,ZuBsPaCe/godot,vkbsb/godot,vkbsb/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,godotengine/godot,godotengine/godot,sanikoyes/godot,josempans/godot,vkbsb/godot,sanikoyes/godot,Shockblast/godot,pkowal1982/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,Shockblast/godot,Shockblast/godot,josempans/godot,vkbsb/godot,godotengine/godot,guilhermefelipecgs/godot,pkowal1982/godot,josempans/godot,BastiaanOlij/godot,Shockblast/godot,josempans/godot,BastiaanOlij/godot,Shockblast/godot,sanikoyes/godot,godotengine/godot,vkbsb/godot,ZuBsPaCe/godot,vkbsb/godot,pkowal1982/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,pkowal1982/godot,sanikoyes/godot,pkowal1982/godot,BastiaanOlij/godot,josempans/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,Shockblast/godot,josempans/godot,BastiaanOlij/godot,godotengine/godot,Shockblast/godot,ZuBsPaCe/godot,sanikoyes/godot,godotengine/godot,josempans/godot,pkowal1982/godot,josempans/godot