Issue #3210699: Empty filters results in multiple ampersands in URL

assets/js/overview_builder.ajax_overview.js

@@ -84,7 +84,9 @@
 
   Drupal.overview_builder_ajax_overview.buildQueryString = function (form_data) {
     let params = Drupal.overview_builder_ajax_overview.buildGetParams(form_data);
-    return params.map(function (x) {
+    return params.filter(function (x) {
+      return x[1] && x[1] != null && x[1].length !== 0;
+    }).map(function (x) {
       if (x[1]) {
         return encodeURIComponent(x[0]) + '=' + encodeURIComponent(x[1]);
       }