Add font to new page only if one exists.

[MacGritsch]

Describe the bug
When a new page is added without adding a font previously, an exception is thrown.
This can be the case if you try to create a PDF by importing other PDF files or also when the font is set inside the header/footer using defaultPageContent.
Attached is a possible patch.

patch.diff.zip

To Reproduce
Simply add a page.

Expected behavior
No exception should be thrown

Environment:

• OS: any
• PHP version: any
• Version: latest

[nicolaasuni]

Thank you for reporting this. It is now fixed in version 8.16.0.