ISTWCMS-6260 Don't allow blank link text when <nolink> is used

uw_cfg_common.module

@@ -1857,8 +1857,17 @@ function _uw_cfg_common_uw_link_validator($element, &$form_state, $form) {
     $form_state->setErrorByName($fieldname, t('The <button> value is not supported for this field.'));
   }
 
-  // Nolink is not allowed, with one exception.
-  if ($uri == '<nolink>' && $fieldname != 'field_uw_event_host][0][uri') {
-    $form_state->setErrorByName($fieldname, t('The &lt;nolink&gt; value is not supported for this field.'));
+  if ($uri == '<nolink>') {
+    // Don't allow blank link text when <nolink> is used.
+    if ($fieldname == 'field_uw_event_host][0][uri') {
+      $link_text = $form_state->getValue('field_uw_event_host')[0]['title'] ?? '';
+      if ($link_text == '') {
+        $form_state->setErrorByName('field_uw_event_host][0][title', t('You must provide link text when using &lt;nolink&gt; as the URL.'));
+      }
+    }
+    else {
+      // Nolink is not allowed, with one exception (event host field).
+      $form_state->setErrorByName($fieldname, t('The &lt;nolink&gt; value is not supported for this field.'));
+    }
   }
 }