PyMuPDF `Link.set_border` gives `TypeError: '<' not supported between instances of 'NoneType' and 'int'`

Description of the bug

When setting the border of links I get the following error:

max@merry ~/github/zotlinksToPdfs                                                    [14:05:18]
(base) > $ python demo.py                                                                      
Traceback (most recent call last):
  File "/home/max/github/zotlinksToPdfs/demo.py", line 12, in <module>
    link.set_border({'width': 1.0, 'dashes': [], 'style': "S"})
  File "/home/max/miniconda3/lib/python3.11/site-packages/pymupdf/__init__.py", line 6475, in set_border
    return self._setBorder(border, self.parent.parent.this, self.xref)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/max/miniconda3/lib/python3.11/site-packages/pymupdf/__init__.py", line 6383, in _setBorder
    b = JM_annot_set_border(border, pdf, link_obj)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/max/miniconda3/lib/python3.11/site-packages/pymupdf/__init__.py", line 14385, in JM_annot_set_border
    if nclouds < 0:
       ^^^^^^^^^^^
TypeError: '<' not supported between instances of 'NoneType' and 'int'

How to reproduce the bug

The minimal example to reproduce the bug is

import fitz  # PyMuPDF

print(fitz.__version__)


doc = fitz.open("test.pdf")

for page_num in range(len(doc)):
    page = doc.load_page(page_num)
    
    link = page.load_links()
    while link is not None:
        link.set_border({'width': 1.0, 'dashes': [], 'style': "S"})
        link = link.next

doc.close()

Thanks for your efforts and the great tool.

Max

As a workaround I added a check for nclouds is not None and in my local version, but I am not sure if this makes sense in general.