Error: Class 'Imagick' not found

The code in createWebpCopy doesn't check for extension so this leads to error.

Error: Class 'Imagick' not found в Drupal\webp\Webp->createWebpCopy() (line 89 from /web/modules/contrib/webp/src/Webp.php)

In webp_requirements we have this condition:

if (extension_loaded('imagick')) {
    $supported_formats = array_map('strtoupper', Imagick::queryFormats());
  }

This prevents from errors during requirements check, but not protect when webp is creating.

I don't provide the patch because it's not clear what way to fix this properly:

1. If everything works without Imagick, we need to improve condition in webp creation method.
2. If it's required, add it to composer dependencies and doesn't allow enable module without it.