OEL-1525: Make view id and display id required if autocomplete is checked.

modules/oe_whitelabel_search/src/Plugin/Block/SearchBlock.php

@@ -194,6 +194,9 @@ class SearchBlock extends BlockBase implements ContainerFactoryPluginInterface {
         'visible' => [
           ':input[name="settings[enable_autocomplete]"]' => ['checked' => TRUE],
         ],
+        'required' => [
+          ':input[name="settings[enable_autocomplete]"]' => ['checked' => TRUE],
+        ],
       ],
     ];
     $form['view_display'] = [
@@ -205,6 +208,9 @@ class SearchBlock extends BlockBase implements ContainerFactoryPluginInterface {
         'visible' => [
           ':input[name="settings[enable_autocomplete]"]' => ['checked' => TRUE],
         ],
+        'required' => [
+          ':input[name="settings[enable_autocomplete]"]' => ['checked' => TRUE],
+        ],
       ],
     ];