Fix handel-server script

scripts/handel-server

@@ -50,7 +50,7 @@ def parse_args(args=None):
         prog='handel-server',
         description='Serve the handel interface over the network using zerorpc')
     parser.add_argument(
-        '--bind', '-b', default='', metavar='address',
+        '--bind', '-b', default='0.0.0.0', metavar='address',
         help='Specify alternate bind address [default: all interfaces]')
     parser.add_argument(
         'port', action='store', default=8000, type=int, nargs='?',