url.js positional params manage extra slashes

Ignore empty slashes. This is mainly so remove the empty positional
parameter that appears when we have a trailing slash on the URL (which
is currently added automatically by NGINX), but will serve as a catchall
for any "empty" slash arguments, much like unix-like distributions
manage filepaths.

browser/js/url.js

@@ -192,7 +192,7 @@ PositionalUrl.prototype.parseUrlParams = function() {
         var slash_params = url.pathname.substr(1).split('/');
         var positional_params = [];
         for (var k = 0; k < slash_params.length; k++) {
-            if(slash_params[k] !== 'browser')
+            if(slash_params[k] !== 'browser' && slash_params[k] !== "")
                 positional_params.push(slash_params[k]);
         }
         var pos_param_keys = this.getStraightParams();