vimperator issue: "map - <something>" does not works

map-minus.diff

diff -ruN a/common/content/commands.js b/common/content/commands.js
--- a/common/content/commands.js	2012-08-04 07:41:20.000000000 +0900
+++ b/common/content/commands.js	2012-09-21 00:09:47.000000000 +0900
@@ -703,7 +703,7 @@
                 liberator.echoerr("Error parsing arguments: " + arg);
                 return null;
             }    // if /^\s*-/ is NOT TRUE, "-" be quoted.
-            else if (!onlyArgumentsRemaining && /^-/.test(arg) && /^\s*-/.test(sub)) {
+            else if (!onlyArgumentsRemaining && /^-/.test(arg) && /^\s*-\S/.test(sub)) {
                 liberator.echoerr("Invalid option: " + arg);
                 return null;
             }