fix(phpstan): added exception handling for missing html2pdf module in OutputTemplate

In OutputTemplate.php, a check has been added to ensure the existence of the 'QUI\HtmlToPdf\Document' class before using it. If the class does not exist, an error message is logged, and an exception is thrown indicating that the html2pdf module is missing. This fix is aimed at avoiding potential errors that may occur due to the absence of the required module.

merged

mentioned in commit 2810542c

This MR is included in version 3.10.9

The release is available on GitLab release.

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