Uncaught exception when dmarc directory missing

[SH]

Reported by user:

request.CRITICAL: Uncaught PHP Exception InvalidArgumentException: "The "/var/log/dmarc/domain.cz" directory does not exist." at /opt/admin/vendor/symfony/symfony/src/Symfony/Component/Finder/Finder.php line 547 {"exception":"[object] (InvalidArgumentException(code: 0): The \"/var/log/dmarc/domain.cz\" directory does not exist. at /opt/admin/vendor/symfony/symfony/src/Symfony/Component/Finder/Finder.php:547)"} []

[SH]

fix #394 add checks if dmarc dir exist

→ <<cset bc8390568cdd>>