PDF transparency error (and fix)

Hi!

I had certain PDFs not creating thumbnails.

Apache logs said:

exception 'ImagickException' with message 'Unable to set image alpha channel' in /var/www/site/htdocs/wp-content/plugins/pdf-image-generator/pdf-image-generator.php:346

Then I came across this:
https://github.com/meumobi/sitebuilder/issues/389#issuecomment-232377250

So I tried to apply this to the code of the plugin by changing

line 346 from

$imagick->setImageAlphaChannel( 11 );

to

if ($imagick->getImageAlphaChannel()) {$imagick->setImageAlphaChannel( 11 );}

and the issue was solved!

Could you please add this fix to the official plugin code?

Thanks!