dont add None, null clip results, fixes #1425

pandora/clip/models.py

@@ -81,6 +81,7 @@ class MetaClip:
                     value = self.item.get(key) or self.item.json.get(key)
                     if not value and hasattr(self.item.sort, key):
                         value = getattr(self.item.sort, key)
+                    if value != None:
                         j[key] = value
         return j