sidebar - fixed colapsable without href causing error

Author: crikfilippo

src/js/components/sidebar.js

@@ -138,7 +138,8 @@ export class KromaSidebar {
         for(var i = 0; i < this.pages.length; i++){
 
             var li = document.createElement('li');
-            li.querySelector('a').removeAttribute('href'); //remove href from collapsable parent
+            //remove href from collapsable parent
+            if (li.querySelector('a') && element.hasAttribute('href')) {li.querySelector('a').removeAttribute('href');}
             li.classList.add('no-selection');
 
             //parent page