Add error logging to Marketo calls

util/saas/useranalytics.py

@@ -14,6 +14,16 @@ class LeadNotFoundException(Exception):
   pass
 
 
+def build_error_callback(message_when_exception):
+  def maybe_log_error(response_future):
+    try:
+      response_future.result()
+    except Exception:
+      logger.exception('User analytics: %s', message_when_exception)
+
+  return maybe_log_error
+
+
 class _MarketoAnalyticsClient(object):
   """ User analytics implementation which will report user changes to the
       Marketo API.