main: Catch command-less case for Python 3.3

In Python 3.2, the argument parser raises an error if no subcommand is
listed on the command line.  This does not seem to be the case with
Python 3.3.0, and the changed behavior seems to have been a side
effect of this:

  http://hg.python.org/cpython/rev/cab204a79e09
  changeset:   70741:cab204a79e09
  user:        R David Murray <rdmurray@bitdance.com>
  date:        Thu Jun 09 12:34:07 2011 -0400
  summary:     #10424: argument names are now included in the missing argument mes

Anyhow, it's easy enough to catch the new behaviour in rss2email and
print the appropriate error.

Reported-by: Dmitry Bogatov <KAction@gnu.org>
Signed-off-by: W. Trevor King <wking@tremily.us>

diff --git a/rss2email/main.py b/rss2email/main.py
index 8a4fb9e61ff2e33b72b8a83573a22a2084629493..74ccd30be950e42a0f3fa1633539c600f64afeea 100644 (file)
--- a/rss2email/main.py
+++ b/rss2email/main.py
@@ -150,6 +150,9 @@ def run(*args, **kwargs):
     if args.verbose:
         _LOG.setLevel(max(_logging.DEBUG, _logging.ERROR - 10 * args.verbose))
 
+    if not getattr(args, 'func', None):
+        parser.error('too few arguments')
+
     try:
         if not args.config:
             args.config = None