[people] Fix if person_ids is None

vrobbler/apps/people/models.py

@@ -33,8 +33,8 @@ class Person(TimeStampedModel):
         count = 0
         for scrobble in Scrobble.objects.filter(user=self.created_by):
             if scrobble.log and isinstance(scrobble.log, dict):
-                person_ids = scrobble.log.get("with_people_ids", [])
-                if self.id in person_ids:
+                person_ids = scrobble.log.get("with_people_ids") or []
+                if person_ids and self.id in person_ids:
                     count += 1
         self.scrobble_count = count
         self.save(update_fields=["scrobble_count"])