Fix PDF Rendering on sea6
Going to https://internal.sip.callpipe.com/app/billing/invoice_render.php gets me "Fatal error: Call to a member function format() on null in /var/www/fusionpbx/app/billing/resources/utils.php on line 37"
I can probably poke around and fix this (seems like a dependency is missing), but I think I may break stuff/install unnecessary stuff.