BUGFIX: Prevent render error if asset is not set in ImageTag

As the thumbnail is generated within „context“ conditions don’t apply yet which could prevent the rendering and therefore the error.

Author: Sebobo

Neos.Media/Classes/Eel/ImageHelper.php

@@ -41,7 +41,7 @@ class ImageHelper implements ProtectedContextAwareInterface
      * @throws ThumbnailServiceException
      */
     public function createThumbnail(
-        AssetInterface $asset,
+        ?AssetInterface $asset,
         ?string $preset = null,
         ?int $width = null,
         ?int $maximumWidth = null,

Neos.Neos/Resources/Private/Fusion/Prototypes/ImageTag.fusion

@@ -10,7 +10,7 @@ prototype(Neos.Neos:ImageTag) < prototype(Neos.Fusion:Tag) {
   async = false
   quality = NULL
   preset = NULL
-  @context.thumbnail = ${Neos.Media.Image.createThumbnail(
+  @context.thumbnail = ${this.asset ? Neos.Media.Image.createThumbnail(
     this.asset,
     this.preset,
     this.width,
@@ -22,7 +22,7 @@ prototype(Neos.Neos:ImageTag) < prototype(Neos.Fusion:Tag) {
     this.async,
     this.quality,
     this.format
-  )}
+  ) : null}
 
   tagName = 'img'
   attributes {