Fix "Cannot use bool as array" error in PHP 8.5

Author: swissspidy

src/wp-admin/includes/image.php

@@ -827,7 +827,13 @@ function wp_read_image_metadata( $file ) {
 		return false;
 	}
 
-	list( , , $image_type ) = wp_getimagesize( $file );
+	$image_size = wp_getimagesize( $file );
+
+	if ( false === $image_size ) {
+		return false;
+	}
+
+	list( , , $image_type ) = $image_size;
 
 	/*
 	 * EXIF contains a bunch of data we'll probably never need formatted in ways