Avoid multiple logging of the same exception.

Author: Roland Hedberg

src/saml2/response.py

@@ -316,7 +316,7 @@ def _loads(self, xmldata, decode=True, origxml=None):
         except SignatureError:
             raise
         except Exception, excp:
-            logger.exception("EXCEPTION: %s", excp)
+            #logger.exception("EXCEPTION: %s", excp)
             raise
 
         #print "<", self.response