update fail message

diff --git a/python.d/python_modules/base.py b/python.d/python_modules/base.py
index ae03ae7243692b6d1fa948a1a5c4e9f0db47508e..f3e94f1dfa0f55b93a84bf620797078d058d3207 100644 (file)
--- a/python.d/python_modules/base.py
+++ b/python.d/python_modules/base.py
@@ -384,6 +384,7 @@ class SimpleService(BaseService):
         """
         data = self._get_data()
         if data is None:
+            self.debug("_get_data() returned no data")
             return False
 
         updated = False