[ImageEncoder] Handle VIPS unsupported image type

plugins/ImageEncoder/Exception/UnsupportedFileTypeException.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Plugin\ImageEncoder\Exception;
+
+use App\Util\Exception\ClientException;
+use Throwable;
+
+class UnsupportedFileTypeException extends ClientException
+{
+    /**
+     * @param string         $message
+     * @param int            $code
+     * @param null|Throwable $previous
+     */
+    public function __construct(string $message = '', int $code = 418, Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+}