Bug 1144837: do not start editing if target not set
Bug 1144837: do not start editing if target not set

mastizada/pontoon,Osmose/pontoon,yfdyh000/pontoon,yfdyh000/pontoon,mozilla/pontoon,jotes/pontoon,jotes/pontoon,Jobava/mirror-pontoon,mathjazz/pontoon,mozilla/pontoon,Jobava/mirror-pontoon,mathjazz/pontoon,mathjazz/pontoon,sudheesh001/pontoon,jotes/pontoon,vivekanand1101/pontoon,mastizada/pontoon,mozilla/pontoon,mastizada/pontoon,Osmose/pontoon,participedia/pontoon,participedia/pontoon,yfdyh000/pontoon,mozilla/pontoon,sudheesh001/pontoon,mastizada/pontoon,Jobava/mirror-pontoon,vivekanand1101/pontoon,Osmose/pontoon,jotes/pontoon,m8ttyB/pontoon,sudheesh001/pontoon,m8ttyB/pontoon,vivekanand1101/pontoon,participedia/pontoon,yfdyh000/pontoon,mathjazz/pontoon,Osmose/pontoon,Jobava/mirror-pontoon,vivekanand1101/pontoon,m8ttyB/pontoon,mozilla/pontoon,mathjazz/pontoon,sudheesh001/pontoon,m8ttyB/pontoon,participedia/pontoon