[music] Fix allmusic lookup

vrobbler/apps/music/models.py

@@ -324,7 +324,9 @@ class Album(TimeStampedModel):
             self.allmusic_id = slug
             self.save(update_fields=["allmusic_id"])
 
-        allmusic_data = scrape_data_from_allmusic(self.allmusic_link)
+        allmusic_data = None
+        if self.allmusic_link:
+            allmusic_data = scrape_data_from_allmusic(self.allmusic_link)
 
         if not allmusic_data:
             logger.info(f"No allmsuic data for {self} by {self.album_artist}")