Don't react on data change notification if the activity is in the process of being shutdown (Closes #3991)
Don't react on data change notification if the activity is in the process of being shutdown (Closes #3991)

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