gd: Don't output empty department elements for gd:organization
gd: Don't output empty department elements for gd:organization

See: bgo#651451

Distrotech/libgdata,Pecisk/libgdata,pwithnall/libgdata,Pecisk/libgdata-gtasks,pwithnall/libgdata,Pecisk/libgdata-gtasks,Pecisk/libgdata,Pecisk/libgdata-gtasks,Distrotech/libgdata,GNOME/libgdata,Distrotech/libgdata,Pecisk/libgdata