Only configure exception view when running in production

apparently that supresses normal traceback on console even..

tailbone/views/common.py

@@ -117,11 +117,13 @@ class CommonView(View):
 
     @classmethod
     def defaults(cls, config):
+        rattail_config = config.registry.settings['rattail_config']
 
         # auto-correct URLs which require trailing slash
         config.add_notfound_view(cls, attr='notfound', append_slash=True)
 
         # exception
+        if rattail_config.production():
             config.add_exception_view(cls, attr='exception', renderer='/exception.mako')
 
         # home