Issue #3437294: Fatal error if image file missing

Closes #3437294

src/Plugin/Field/FieldFormatter/ImageBase64Formatter.php

@@ -244,18 +244,26 @@ class ImageBase64Formatter extends ImageFormatter {
       }
 
       // Encode image in base64 format.
-      $image_file = file_get_contents($absolute_path);
-      $base_64_image = base64_encode($image_file);
-      $base_64_data = "data:$image_type;base64,$base_64_image";
-
-      // Get the image's width and height, int|null.
-      $image_media = $this->imageFactory->get($absolute_path);
-      if ($image_media->isValid()) {
-        $width = $image_media->getWidth();
-        $height = $image_media->getHeight();
-      }
-      else {
+      if (empty($absolute_path) || !file_exists($absolute_path)) {
+      
+        \Drupal::logger('image_base64_formatter')->error('Image file not found at: @uri', ['@uri' => $absolute_path]);
+        
+        $base_64_data = NULL;
         $width = $height = NULL;
+      } else {
+          // Encode image in base64 format.
+          $image_file = file_get_contents($absolute_path);
+          $base_64_image = base64_encode($image_file);
+          $base_64_data = "data:$image_type;base64,$base_64_image";
+      
+          // Get the image's width and height, int|null.
+          $image_media = $this->imageFactory->get($absolute_path);
+          if ($image_media->isValid()) {
+              $width = $image_media->getWidth();
+              $height = $image_media->getHeight();
+          } else {
+              $width = $height = NULL;
+          }
       }
 
       switch ($image_display) {