remove Eclipse compile error
remove Eclipse compile error

Unfortunately Eclipse cannot be told which null contract is valid for
external calls.
yummy222/cgeo,Huertix/cgeo,samueltardieu/cgeo,mucek4/cgeo,tobiasge/cgeo,xiaoyanit/cgeo,pstorch/cgeo,KublaikhanGeek/cgeo,SammysHP/cgeo,matej116/cgeo,matej116/cgeo,tobiasge/cgeo,kumy/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,auricgoldfinger/cgeo,pstorch/cgeo,brok85/cgeo,vishwakulkarni/cgeo,auricgoldfinger/cgeo,S-Bartfast/cgeo,Huertix/cgeo,yummy222/cgeo,cgeo/cgeo,rsudev/c-geo-opensource,mucek4/cgeo,schwabe/cgeo,pstorch/cgeo,xiaoyanit/cgeo,lewurm/cgeo,Bananeweizen/cgeo,kumy/cgeo,KublaikhanGeek/cgeo,superspindel/cgeo,Huertix/cgeo,marco-dev/c-geo-opensource,superspindel/cgeo,schwabe/cgeo,matej116/cgeo,samueltardieu/cgeo,vishwakulkarni/cgeo,marco-dev/c-geo-opensource,ThibaultR/cgeo,madankb/cgeo,madankb/cgeo,superspindel/cgeo,madankb/cgeo,ThibaultR/cgeo,samueltardieu/cgeo,vishwakulkarni/cgeo,kumy/cgeo,ThibaultR/cgeo,schwabe/cgeo,Bananeweizen/cgeo,marco-dev/c-geo-opensource,S-Bartfast/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,KublaikhanGeek/cgeo,schwabe/cgeo,cgeo/cgeo,SammysHP/cgeo,tobiasge/cgeo,S-Bartfast/cgeo,xiaoyanit/cgeo,yummy222/cgeo,lewurm/cgeo,lewurm/cgeo,auricgoldfinger/cgeo,brok85/cgeo,SammysHP/cgeo,Bananeweizen/cgeo,brok85/cgeo,mucek4/cgeo