Title

Generate PDF fails if custom PDF HTML field is empty

Expected Behavior

Current Behavior

No response

Steps to Reproduce

No response

Screenshots (Optional)

ERROR --> Severity: Warning --> Undefined array key "footer" ip/vendor/mpdf/mpdf/src/Mpdf.php 13478

Possible Solution (Optional)

Control the case where footer is not filled.

Context (Environment)

I've tried it on a brand new install. v1.7.0 mariadb php 8.3

Failure Logs (Optional)

No response