Merge pull request #1429 from bashlakov/search_fix

Search fix

src/extensions/filter-control/bootstrap-table-filter-control.js

@@ -89,7 +89,7 @@
     var existsOptionInSelectControl = function (selectControl, value) {
         var options = selectControl.get(selectControl.length - 1).options;
         for (var i = 0; i < options.length; i++) {
-            if (options[i].value === value) {
+            if (options[i].value === value.toString()) {
                 //The value is nor valid to add
                 return false;
             }