diff --git a/_modules/apiclient/maas_client.py b/_modules/apiclient/maas_client.py
index 9a184c5..530e6b2 100644
--- a/_modules/apiclient/maas_client.py
+++ b/_modules/apiclient/maas_client.py
@@ -225,7 +225,8 @@
             POST it as application/json
         :return: The result of the dispatch_query call on the dispatcher.
         """
-        kwargs['op'] = op
+        if op is not None:
+            kwargs['op'] = op
         url, headers, body = self._formulate_change(
             path, kwargs, as_json=as_json)
         return self.dispatcher.dispatch_query(
diff --git a/_modules/apiclient/multipart.py b/_modules/apiclient/multipart.py
index f6c5ce8..7ed17a6 100644
--- a/_modules/apiclient/multipart.py
+++ b/_modules/apiclient/multipart.py
@@ -56,6 +56,8 @@
 
 
 def make_file_payload(name, content):
+    print('********************************')
+    print('content %s' % content)
     payload = MIMEApplication(content.read())
     payload.add_header(
         "Content-Disposition", "form-data", name=name, filename=name)