avoid crash with empty concavepolygonshape, fixes #3169
avoid crash with empty concavepolygonshape, fixes #3169

akien-mga/godot,firefly2442/godot,Shockblast/godot,Shockblast/godot,est31/godot,Zylann/godot,iap-mutant/godot,ex/godot,TheHX/godot,agusbena/godot,quabug/godot,rollenrolm/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,NateWardawg/godot,MarianoGnu/godot,TheHX/godot,vnen/godot,godotengine/godot,FateAce/godot,mcanders/godot,vnen/godot,teamblubee/godot,pixelpicosean/my-godot-2.1,ianholing/godot,Zylann/godot,FateAce/godot,pkowal1982/godot,akien-mga/godot,exabon/godot,mcanders/godot,ageazrael/godot,jejung/godot,Hodes/godot,Max-Might/godot,josempans/godot,RebelliousX/Go_Dot,Valentactive/godot,NateWardawg/godot,OpenSocialGames/godot,exabon/godot,DmitriySalnikov/godot,Brickcaster/godot,crr0004/godot,FateAce/godot,MrMaidx/godot,azurvii/godot,ficoos/godot,mrezai/godot,Marqin/godot,opmana/godot,godotengine/godot,ianholing/godot,honix/godot,vnen/godot,OpenSocialGames/godot,akien-mga/godot,BastiaanOlij/godot,gau-veldt/godot,DmitriySalnikov/godot,iap-mutant/godot,TheHX/godot,vkbsb/godot,groud/godot,vkbsb/godot,RandomShaper/godot,pkowal1982/godot,RebelliousX/Go_Dot,tomreyn/godot,akien-mga/godot,jejung/godot,mrezai/godot,ficoos/godot,teamblubee/godot,pixelpicosean/my-godot-2.1,n-pigeon/godot,MrMaidx/godot,iap-mutant/godot,ex/godot,ficoos/godot,huziyizero/godot,huziyizero/godot,ex/godot,JoshuaGrams/godot,agusbena/godot,ianholing/godot,morrow1nd/godot,Hodes/godot,josempans/godot,pixelpicosean/my-godot-2.1,groud/godot,NateWardawg/godot,godotengine/godot,mrezai/godot,guilhermefelipecgs/godot,Faless/godot,tomreyn/godot,FateAce/godot,ianholing/godot,jejung/godot,Zylann/godot,sanikoyes/godot,huziyizero/godot,Valentactive/godot,azurvii/godot,n-pigeon/godot,MrMaidx/godot,ianholing/godot,honix/godot,MrMaidx/godot,vkbsb/godot,okamstudio/godot,n-pigeon/godot,ageazrael/godot,NateWardawg/godot,Valentactive/godot,iap-mutant/godot,Paulloz/godot,honix/godot,Brickcaster/godot,agusbena/godot,guilhermefelipecgs/godot,zicklag/godot,mcanders/godot,ianholing/godot,godotengine/godot,azurvii/godot,honix/godot,agusbena/godot,RandomShaper/godot,Valentactive/godot,OpenSocialGames/godot,Marqin/godot,Brickcaster/godot,est31/godot,mcanders/godot,agusbena/godot,DmitriySalnikov/godot,josempans/godot,ficoos/godot,firefly2442/godot,josempans/godot,josempans/godot,teamblubee/godot,Zylann/godot,ageazrael/godot,firefly2442/godot,ficoos/godot,Faless/godot,rollenrolm/godot,okamstudio/godot,NateWardawg/godot,ianholing/godot,RebelliousX/Go_Dot,Paulloz/godot,buckle2000/godot,quabug/godot,buckle2000/godot,ZuBsPaCe/godot,JoshuaGrams/godot,MarianoGnu/godot,OpenSocialGames/godot,ficoos/godot,ZuBsPaCe/godot,Zylann/godot,ageazrael/godot,quabug/godot,Max-Might/godot,crr0004/godot,groud/godot,tomreyn/godot,Shockblast/godot,Shockblast/godot,quabug/godot,sanikoyes/godot,Valentactive/godot,Max-Might/godot,OpenSocialGames/godot,okamstudio/godot,crr0004/godot,groud/godot,vkbsb/godot,Max-Might/godot,gau-veldt/godot,teamblubee/godot,akien-mga/godot,NateWardawg/godot,ZuBsPaCe/godot,ex/godot,quabug/godot,Brickcaster/godot,firefly2442/godot,FateAce/godot,pixelpicosean/my-godot-2.1,Paulloz/godot,gau-veldt/godot,zicklag/godot,firefly2442/godot,n-pigeon/godot,Marqin/godot,okamstudio/godot,sanikoyes/godot,vnen/godot,jejung/godot,Paulloz/godot,OpenSocialGames/godot,mrezai/godot,RandomShaper/godot,JoshuaGrams/godot,opmana/godot,Shockblast/godot,jejung/godot,n-pigeon/godot,guilhermefelipecgs/godot,gau-veldt/godot,Faless/godot,TheHX/godot,RandomShaper/godot,vnen/godot,Shockblast/godot,NateWardawg/godot,MarianoGnu/godot,OpenSocialGames/godot,okamstudio/godot,NateWardawg/godot,opmana/godot,NateWardawg/godot,teamblubee/godot,agusbena/godot,OpenSocialGames/godot,Zylann/godot,crr0004/godot,zicklag/godot,Shockblast/godot,iap-mutant/godot,RandomShaper/godot,guilhermefelipecgs/godot,ianholing/godot,n-pigeon/godot,tomreyn/godot,godotengine/godot,ageazrael/godot,mrezai/godot,quabug/godot,ex/godot,DmitriySalnikov/godot,MarianoGnu/godot,firefly2442/godot,pkowal1982/godot,vnen/godot,Hodes/godot,ianholing/godot,quabug/godot,huziyizero/godot,mrezai/godot,DmitriySalnikov/godot,zicklag/godot,morrow1nd/godot,sanikoyes/godot,Brickcaster/godot,mrezai/godot,RandomShaper/godot,Hodes/godot,ex/godot,honix/godot,pixelpicosean/my-godot-2.1,Paulloz/godot,guilhermefelipecgs/godot,vkbsb/godot,rollenrolm/godot,Hodes/godot,MrMaidx/godot,BastiaanOlij/godot,mcanders/godot,rollenrolm/godot,Valentactive/godot,morrow1nd/godot,sanikoyes/godot,mrezai/godot,akien-mga/godot,groud/godot,iap-mutant/godot,okamstudio/godot,BastiaanOlij/godot,n-pigeon/godot,RandomShaper/godot,exabon/godot,crr0004/godot,rollenrolm/godot,morrow1nd/godot,firefly2442/godot,Hodes/godot,crr0004/godot,crr0004/godot,firefly2442/godot,ZuBsPaCe/godot,Brickcaster/godot,BastiaanOlij/godot,est31/godot,mcanders/godot,josempans/godot,iap-mutant/godot,BastiaanOlij/godot,josempans/godot,MarianoGnu/godot,BastiaanOlij/godot,okamstudio/godot,gau-veldt/godot,Valentactive/godot,MarianoGnu/godot,quabug/godot,teamblubee/godot,ianholing/godot,RebelliousX/Go_Dot,MarianoGnu/godot,sanikoyes/godot,exabon/godot,vkbsb/godot,honix/godot,TheHX/godot,OpenSocialGames/godot,Zylann/godot,vnen/godot,MrMaidx/godot,Marqin/godot,agusbena/godot,ZuBsPaCe/godot,pkowal1982/godot,opmana/godot,quabug/godot,iap-mutant/godot,morrow1nd/godot,ageazrael/godot,exabon/godot,teamblubee/godot,Paulloz/godot,buckle2000/godot,akien-mga/godot,Brickcaster/godot,MarianoGnu/godot,vkbsb/godot,sanikoyes/godot,Max-Might/godot,Zylann/godot,Max-Might/godot,azurvii/godot,sanikoyes/godot,zicklag/godot,okamstudio/godot,crr0004/godot,vkbsb/godot,JoshuaGrams/godot,Shockblast/godot,teamblubee/godot,ex/godot,teamblubee/godot,iap-mutant/godot,buckle2000/godot,Faless/godot,pkowal1982/godot,ZuBsPaCe/godot,BastiaanOlij/godot,buckle2000/godot,ex/godot,pkowal1982/godot,okamstudio/godot,Marqin/godot,crr0004/godot,Valentactive/godot,jejung/godot,ageazrael/godot,godotengine/godot,ZuBsPaCe/godot,est31/godot,exabon/godot,Paulloz/godot,guilhermefelipecgs/godot,huziyizero/godot,est31/godot,agusbena/godot,DmitriySalnikov/godot,iap-mutant/godot,morrow1nd/godot,azurvii/godot,azurvii/godot,zicklag/godot,opmana/godot,RebelliousX/Go_Dot,groud/godot,OpenSocialGames/godot,RebelliousX/Go_Dot,quabug/godot,josempans/godot,DmitriySalnikov/godot,akien-mga/godot,FateAce/godot,JoshuaGrams/godot,godotengine/godot,Faless/godot,Faless/godot,guilhermefelipecgs/godot,okamstudio/godot,Faless/godot,crr0004/godot,teamblubee/godot,vnen/godot,pkowal1982/godot,Faless/godot,godotengine/godot,pkowal1982/godot,JoshuaGrams/godot,Marqin/godot,buckle2000/godot,est31/godot,tomreyn/godot,BastiaanOlij/godot