jw-pkg.sh: Print help for missing subcommands

Print a help message if no subcommand is specified for one of the
comamnds "distro" and "projects".

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/App.py

@@ -22,6 +22,7 @@ class App: # export
             parser = parsers.add_parser(cmd.name, help=cmd.help, formatter_class=argparse.ArgumentDefaultsHelpFormatter)
             parser.set_defaults(func=cmd.run)
             cmd.add_arguments(parser)
+            cmd.set_parser(parser)
             return parser
 
         def add_cmds_to_parser(parent, parser, cmds, all=False):