play_count should not fail on None values

server/djrandom/frontend/frontend.py

@@ -50,7 +50,10 @@ def play_callback(sha1):
     mp3 = MP3.query.get(sha1)
     if not mp3:
         abort(404)
+    if mp3.play_count:
         mp3.play_count += 1
+    else:
+        mp3.play_count = 1
     Session.add(mp3)
     Session.commit()
     return jsonify(status=True)