Fatal error when image cannot be converted to WebP

[colesnic89]

PHP 7.4.

I expected to be a fallback option with original image, but it throws an error
imagecreatefromjpeg(): gd-jpeg: JPEG library reports unrecoverable error: Not a JPEG file: starts with 0x89 0x50

It happens when PNG image was saved with .jpg extension (and vice versa). So in this case better solution is to use exif_imagetype function to determine real image type, instead of image extension.