fix: Fixed an issue where using a transform method other than Craft a…

…long with `asset.getUrl()` in your templates could throw an exception ([#363](#363))

src/ImageOptimize.php

@@ -337,9 +337,12 @@ static function (ImageTransformerOperationEvent $event): void {
                     __METHOD__
                 );
                 // Return the path to the optimized image to _createTransformForAsset()
-                $event->path = ImageOptimize::$plugin->optimize->handleGenerateTransformEvent(
+                $tempPath = ImageOptimize::$plugin->optimize->handleGenerateTransformEvent(
                     $event
                 );
+                if ($tempPath) {
+                    $event->tempPath = $tempPath;
+                }
             }
         );