no log: added failsafe for compare str to None while trying to sort.

bazarr/api/utils.py

@@ -199,6 +199,7 @@ def postprocessMovie(item):
             desired_lang_list = get_desired_languages(item['profileId'])
             item['subtitles'] = [x for x in item['subtitles'] if x['code2'] in desired_lang_list or x['path']]
 
+        if item['subtitles']:
             item['subtitles'] = sorted(item['subtitles'], key=itemgetter('name', 'forced'))
 
     # Parse missing subtitles