Do not try to copy empty coordinates when editing waypoint
Do not try to copy empty coordinates when editing waypoint

Also, better be safe than sorry, allow null name and note.

This fixes #481.

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