Fix crash caused by null parameter passed to CameraServer.add_feed()
Fix crash caused by null parameter passed to CameraServer.add_feed()

Fixes #46181

CameraServer.add_feed() takes a CameraFeed object type as parameter.
Passing in another type of data while binding the method it will make
tha parameter null.
Added a check for null which returns from function and does not make the
engine crash anymore.

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