Fix not clearing a Joint3D with only a B node when removing the B node
Fix not clearing a Joint3D with only a B node when removing the B node

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