fixes #1950 - StaticMapsProvider checks input parameter for null
fixes #1950 - StaticMapsProvider checks input parameter for null

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