hardened error checking

src/Plugin/Action/GenerateImageMediaDimensions.php

@@ -66,13 +66,14 @@ final class GenerateImageMediaDimensions extends ActionBase implements Container
    * Action execution.
    */
   public function execute(ContentEntityInterface $entity = NULL): void {
-    $height = $entity->get('field_height')->getValue()[0]['value'];
+    $height = $entity->get('field_height')->value;
-    $width = $entity->get('field_width')->getValue()[0]['value'];
+    $width = $entity->get('field_width')->value;
     $field = $entity->hasField('field_media_file') ? 'field_media_file' : 'field_media_image';
     if (!$width || !$height) {
       if ($entity->hasField($field) && !$entity->get($field)->isEmpty()) {
         $file = $entity->get($field)->entity;
         $realpath = $this->fileSystem->realpath($file->getFileUri());
+        if ($realpath) {
           $dimensions = getimagesize($realpath);
           if ($dimensions) {
             $entity->set('field_height', $dimensions[1]);
@@ -80,6 +81,8 @@ final class GenerateImageMediaDimensions extends ActionBase implements Container
             $entity->save();
           }
         }
+
+      }
     }
   }
 }