Fix Py3 exception handling (grrr old except Error,msg was better ..)

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/branches/fork@1618 b32b6428-25c9-4566-ad07-03861ab6144f

devices/weather/OpenWeatherMap/xaal/owm/gw.py

@@ -55,7 +55,7 @@ class GW:
     def update(self):
         try:
             self._update()
-        except OWMError,e:
+        except OWMError as e:
             logger.warn(e)
 
     def _update(self):