Fix missing episode poster in certain views

- Fixes #453

resources/lib/PlexAPI.py

@@ -772,15 +772,16 @@ class API(object):
             # Artwork lookup for episodes is broken for addon paths
             # Episodes is a bit special, only get the thumb, because all
             # the other artwork will be saved under season and show
-            for kodi_artwork, plex_artwork in v.KODI_TO_PLEX_ARTWORK.iteritems():
+            for kodi_artwork, plex_artwork in \
+                    v.KODI_TO_PLEX_ARTWORK_EPISODE.iteritems():
                 art = self._one_artwork(plex_artwork)
                 if art:
                     artworks[kodi_artwork] = art
-            if full_artwork:
+            if not full_artwork:
+                return artworks
             with plexdb.Get_Plex_DB() as plex_db:
-                    db_item = plex_db.getItem_byId(self.plex_id())
                 try:
-                    season_id = db_item[3]
+                    season_id = plex_db.getItem_byId(self.plex_id())[3]
                 except TypeError:
                     return artworks
             # Grab artwork from the season
@@ -790,9 +791,9 @@ class API(object):
                 artworks['season.%s' % kodi_art] = season_art[kodi_art]
             # Get the show id
             with plexdb.Get_Plex_DB() as plex_db:
-                    db_item = plex_db.getItem_byId(self.grandparent_id())
                 try:
-                    show_id = db_item[0]
+                    show_id = plex_db.getItem_byKodiId(season_id,
+                                                       v.KODI_TYPE_SEASON)[1]
                 except TypeError:
                     return artworks
             # Grab more artwork from the show

resources/lib/variables.py

@@ -325,6 +325,13 @@ KODI_TO_PLEX_ARTWORK = {
     'fanart': 'art'
 }
 
+KODI_TO_PLEX_ARTWORK_EPISODE = {
+    'thumb': 'thumb',
+    'poster': 'grandparentThumb',
+    'banner': 'banner',
+    'fanart': 'art'
+}
+
 # Might be implemented in the future: 'icon', 'landscape' (16:9)
 ALL_KODI_ARTWORK = (
     'thumb',