Fix search form validation

ram/portal/static/js/src/validators.js

@@ -0,0 +1,15 @@
+document.addEventListener("DOMContentLoaded", function () {
+    'use strict'
+
+    const forms = document.querySelectorAll('.needs-validation')
+    Array.from(forms).forEach(form => {
+      form.addEventListener('submit', event => {
+        if (!form.checkValidity()) {
+          event.preventDefault()
+          event.stopPropagation()
+        }
+
+        form.classList.add('was-validated')
+      }, false)
+    })
+});