Fix crash when previewing null AudioStream
Fix crash when previewing null AudioStream

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