Not hide the docstring of the decorate methods

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58622 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/pygrass/errors.py

@@ -42,4 +42,5 @@ def must_be_open(method):
             return method(self, *args, **kargs)
         else:
             warning(_("The map is close!"))
+    wrapper.__doc__ = method.__doc__
     return wrapper