[FIX] breakage due to backbone change: in 1.0+, this.reset() will call this.add()

in 0.9, this.add would only be called if items were provided to
reset(), changed in commit cf6e862.

bzr revid: xmo@openerp.com-20131202151037-xxmvu5790p2jsxz6

addons/web/static/src/js/search.js

@@ -71,7 +71,10 @@ my.SearchQuery = B.Collection.extend({
     },
     add: function (values, options) {
         options = options || {};
-        if (!(values instanceof Array)) {
+
+        if (!values) {
+            values = [];
+        } else if (!(values instanceof Array)) {
             values = [values];
         }