Added default value for dont_convert option, addressing crashes.
@@ -141,6 +141,7 @@ class ConvertPlugin(BeetsPlugin):
u'quiet': False,
u'embed': True,
u'paths': {},
+ u'dont_convert': u'',
u'never_convert_lossy_files': False,
u'copy_album_art': False,
u'album_art_maxwidth': 0,
