Extend queryToObject function

This extends the queryToObject function
to remove undefined values from the resulting
object

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

@@ -271,7 +271,9 @@ export function queryToObject(query) {
   const removeQuestionMarkFromQuery = String(query).startsWith('?') ? query.slice(1) : query;
   return removeQuestionMarkFromQuery.split('&').reduce((accumulator, curr) => {
     const p = curr.split('=');
-    accumulator[decodeURIComponent(p[0])] = decodeURIComponent(p[1]);
+    if (p[1] !== undefined) {
+      accumulator[decodeURIComponent(p[0])] = decodeURIComponent(p[1]);
+    }
     return accumulator;
   }, {});
 }

spec/frontend/lib/utils/url_utility_spec.js

@@ -425,6 +425,12 @@ describe('URL utility', () => {
 
       expect(urlUtils.queryToObject(searchQuery)).toEqual({ one: '1', two: '2' });
     });
+
+    it('removes undefined values from the search query', () => {
+      const searchQuery = '?one=1&two=2&three';
+
+      expect(urlUtils.queryToObject(searchQuery)).toEqual({ one: '1', two: '2' });
+    });
   });
 
   describe('objectToQuery', () => {