If policy section not available in client config, no exception should be raised
Motivation
----------
There are two `config_get('policy', ...)` calls in the bin/rucio code. However, if the policy section is not available in the config an error is raised. This should not happen. Default values should be used. ("")
diff --git a/lib/rucio/common/config.py b/lib/rucio/common/config.py
index 7348589fa..e6cddc76d 100644
--- a/lib/rucio/common/config.py
+++ b/lib/rucio/common/config.py
@@ -55,7 +55,7 @@ def config_get(section, option, raise_exception=True, default=None):
     try:
         return __CONFIG.get(section, option)
     except (ConfigParser.NoOptionError, ConfigParser.NoSectionError) as err:
-        if raise_exception:
+        if raise_exception and default is None:
             raise err
         return default
 
['lib/rucio/common/config.py']