TD-5086: Fixed console errors on LH landing page

Author: ArunimaGeorge

LearningHub.Nhs.WebUI/Views/Shared/_ValidationScriptsPartial.cshtml

@@ -21,7 +21,10 @@
 
     let errorElements = [];
     let submitAttempted = false;
-    document.querySelector('form').onsubmit = () => { submitAttempted = true; }
+    const form = document.querySelector('form');
+    if (form) {
+        form.onsubmit = () => { submitAttempted = true; }
+    }
 
     $(function () {
         $('form').each(function () {