Handle empty arguments when computing the OAuth base string

vendor/assets/ohauth/ohauth.js

@@ -16,7 +16,9 @@ ohauth.qsString = function(obj) {
 };
 
 ohauth.stringQs = function(str) {
-    return str.split('&').reduce(function(obj, pair){
+    return str.split('&').filter(function (pair) {
+        return pair !== '';
+    }).reduce(function(obj, pair){
         var parts = pair.split('=');
         obj[decodeURIComponent(parts[0])] = (null === parts[1]) ?
             '' : decodeURIComponent(parts[1]);