Set the flag description as optional

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@60940 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/pygrass/modules/interface/flag.py

@@ -20,7 +20,7 @@ class Flag(object):
         self.name = diz['name']
         self.special = True if self.name in (
             'verbose', 'overwrite', 'quiet', 'run') else False
-        self.description = diz['description']
+        self.description = diz.get('description', None)
         self.default = diz.get('default', None)
         self.guisection = diz.get('guisection', None)