Make sure inputs plugin doesn't crash when task doesn't have no_entries_ok attribute. fix #1861

git-svn-id: http://svn.flexget.com/trunk@3237 3942dd89-8c5d-46d7-aeed-044bccf3e60c
Make sure crossmatch doesn't crash when inputs return None. fix #1859

git-svn-id: http://svn.flexget.com/trunk@3238 3942dd89-8c5d-46d7-aeed-044bccf3e60c