Fix FutureWarning

resources/lib/playlists.py

@@ -321,7 +321,7 @@ def process_websocket(plex_id, status):
                 delete_kodi_playlist(playlist)
             elif playlist:
                 xml = PL.get_pms_playlist_metadata(plex_id)
-                if not xml:
+                if xml is None:
                     LOG.error('Could not download playlist %s', plex_id)
                     return
                 api = API(xml[0])

resources/lib/plex_api.py

@@ -1218,7 +1218,7 @@ class API(object):
         Pass in the collection id of e.g. the movie's metadata
         """
         xml = PF.collections(self.library_section_id())
-        if not xml:
+        if xml is None:
             return []
         return [(i.get('index'), i.get('ratingKey')) for i in xml]