Fixes #3608, TB details empty
Fixes #3608, TB details empty

- moved url null check to beginning of image fetch.

brok85/cgeo,vishwakulkarni/cgeo,marco-dev/c-geo-opensource,Huertix/cgeo,S-Bartfast/cgeo,S-Bartfast/cgeo,xiaoyanit/cgeo,tobiasge/cgeo,madankb/cgeo,Bananeweizen/cgeo,madankb/cgeo,rsudev/c-geo-opensource,ThibaultR/cgeo,marco-dev/c-geo-opensource,Huertix/cgeo,yummy222/cgeo,cgeo/cgeo,schwabe/cgeo,auricgoldfinger/cgeo,superspindel/cgeo,schwabe/cgeo,auricgoldfinger/cgeo,vishwakulkarni/cgeo,kumy/cgeo,xiaoyanit/cgeo,schwabe/cgeo,samueltardieu/cgeo,samueltardieu/cgeo,mucek4/cgeo,brok85/cgeo,kumy/cgeo,tobiasge/cgeo,SammysHP/cgeo,auricgoldfinger/cgeo,cgeo/cgeo,S-Bartfast/cgeo,vishwakulkarni/cgeo,lewurm/cgeo,rsudev/c-geo-opensource,superspindel/cgeo,matej116/cgeo,schwabe/cgeo,matej116/cgeo,pstorch/cgeo,kumy/cgeo,ThibaultR/cgeo,pstorch/cgeo,xiaoyanit/cgeo,rsudev/c-geo-opensource,SammysHP/cgeo,brok85/cgeo,KublaikhanGeek/cgeo,marco-dev/c-geo-opensource,lewurm/cgeo,ThibaultR/cgeo,superspindel/cgeo,yummy222/cgeo,pstorch/cgeo,matej116/cgeo,Bananeweizen/cgeo,samueltardieu/cgeo,KublaikhanGeek/cgeo,cgeo/cgeo,Bananeweizen/cgeo,SammysHP/cgeo,mucek4/cgeo,yummy222/cgeo,cgeo/cgeo,KublaikhanGeek/cgeo,mucek4/cgeo,tobiasge/cgeo,Huertix/cgeo,lewurm/cgeo,madankb/cgeo