don't add empty query params to boards

app/assets/javascripts/lib/utils/common_utils.js

@@ -138,6 +138,7 @@ export const getUrlParamsArray = () =>
   window.location.search
     .slice(1)
     .split('&')
+    .filter(param => param.length > 0)
     .map(param => {
       const split = param.split('=');
       return [decodeURI(split[0]), split[1]].join('=');

ee/app/assets/javascripts/boards/stores/boards_store_ee.js

@@ -34,6 +34,7 @@ class BoardsStoreEE {
     };
 
     this.store.updateFiltersUrl = (replaceState = false) => {
+      if (!this.store.filter.path) return;
       if (replaceState) {
         window.history.replaceState(null, null, `?${this.store.filter.path}`);
       } else {

ee/changelogs/unreleased/boards-querystring.yml

+---
+title: don't add empty query params to boards
+merge_request: 4441
+author:
+type: fixed

spec/javascripts/lib/utils/common_utils_spec.js

@@ -30,8 +30,10 @@ describe('common_utils', () => {
   });
 
   describe('getUrlParamsArray', () => {
-    it('should return params array', () => {
-      expect(commonUtils.getUrlParamsArray() instanceof Array).toBe(true);
+    it('returns empty array for empty querystring', () => {
+      expect(
+        commonUtils.getUrlParamsArray()
+      ).toEqual([]);
     });
 
     it('should remove the question mark from the search params', () => {