Saving file with WEBP

[slav123]

From some reason can't save WEBP file - it works only if I force "JPEG" otherwise wlil get: "ERROR_WAND: Wand contains no images `%!s(MISSING) (MagickWand-2)"

	defer mw.Destroy()
	if err := mw.ReadImage(orig); err != nil {
		log.Errorf(err.Error())
	}

		filter := gmagick.FILTER_MITCHELL
		w := mw.GetImageWidth()
		h := mw.GetImageHeight()
		mw.ResizeImage(w/2, h/2, filter, 0)
//		mw.SetFormat("JPEG")
		if err := mw.WriteImage(dest); err != nil {
			log.Errorf(err.Error())
		}```