Allow gltf2 morph targets with no default values. Changes for bug 38751
Allow gltf2 morph targets with no default values. Changes for bug 38751


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