fix: Fix displaying inaccessible application - MEED-7411 - Meeds-io/M…

…IPs#156 (#205)

Prior to this change, when adding a not accessible application inside a
page using a dynamic container (with access permissions that the user is
not member of), then a 'null' string is displayed instead of displaying
an empty content. This change, ensures to not display the application at
all and even hide the parent element to not have an additional padding.

layout-webapp/src/main/webapp/vue-app/common/js/ApplicationUtils.js

@@ -201,6 +201,10 @@ export function handleApplicationContent(applicationContent, applicationElement)
   const newHtmlDocument = document.createElement('div');
   newHtmlDocument.innerHTML = newBodyContent;
   const portletContent = newHtmlDocument.querySelector('.UIWorkingWorkspace .PORTLET-FRAGMENT');
+  if (!portletContent) {
+    applicationElement.classList.add('hidden');
+    return;
+  }
   const oldPortletContent = applicationElement.querySelector('.PORTLET-FRAGMENT');
   if (oldPortletContent) {
     oldPortletContent.remove();