Very basic CDR aggregation draft fix2

app/app.py

@@ -850,7 +850,7 @@ class Calls(Resource):
         call['type'] = 'in'
         if 'did' in _call0:
           call['line'] = _call0['did']
-      if len(_call['events'] > 1):
+      if len(_call['events']) > 1:
         for step in _call['events'][1:]:
           pass
       calls.append(call)