fix error when configuration file is empty

diff --git a/plugins.d/python.d.plugin b/plugins.d/python.d.plugin
index 741ba1f7378a28c8010633b00f9de4964fb0f592..02f3024f88c426b5c7b02a04d91840670a5a00fe 100755 (executable)
--- a/plugins.d/python.d.plugin
+++ b/plugins.d/python.d.plugin
@@ -206,6 +206,8 @@ class PythonCharts(object):
         :param config: dict
         :return: dict
         """
+        if config is None:
+            config = {}
         # get default values
         defaults = {}
         msg.debug(module.__name__ + ": reading configuration")