Some insertion methods fails for pages without a /Resources object

[JorjMcKie]

Description of the bug

For attached file, TexWriter text insertions and .insert_htmlbox will fail.

How to reproduce the bug

doc=pymupdf.open("FzErrorArgument_single_page.pdf")
page=doc[0]
page.insert_htmlbox((100,100,200,200),"Hallo")

Will fail - similar for TextWriter.
FzErrorArgument_single_page.pdf

PyMuPDF version

1.25.1

Operating system

Other

Python version

3.12

[julian-smith-artifex-com]

Fixed in PyMuPDF-1.25.3.