update in removeing the required field

src/Plugin/Field/FieldFormatter/BgImgFieldFormatter.php

@@ -138,9 +138,6 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
     // Load the files to render.
     $files = [];
     foreach ($items->getValue() as $item) {
-      if (!isset($file['file'])) {
-        continue;
-      }
       $files[] = [
         'file' => File::load($item['target_id']),
         'item' => $item

src/Plugin/Field/FieldWidget/BgImageFieldWidget.php

@@ -111,7 +111,8 @@ class BgImageFieldWidget extends ImageWidget {
 
       // Background selector value.
       $selector = !empty($element['#value']['css_selector']) ?
-        $element['#value']['css_selector'] : $css_option_settings['css_selector'];
+      $element['#value']['css_selector'] : $css_option_settings['css_selector'];
+
       // The css selector input field needed to
       $elements['css_settings']['css_selector'] = [
         '#type' => 'textfield',
@@ -120,7 +121,7 @@ class BgImageFieldWidget extends ImageWidget {
         '#default_value' => $selector,
         '#token_types' => $token_types,
         '#element_validate' => 'token_element_validate',
-        '#required' => TRUE,
+        '#required' => FALSE,
       ];
 
       // The tokens that are scoped for the selector input.