Merging fails with missing /Dests

[stefan6419846]

Append a page to a PdfWriter might fail.

Environment

pypdf 5.4.0 with Python 3.11

Code + PDF

This is a minimal, complete example that shows the issue:

from pypdf import PdfWriter

writer = PdfWriter(clone_from='file1.pdf')
writer.append('file2.pdf')

I still have to find/generate a corresponding PDF file which does not contain personal information.

Traceback

This is the complete traceback I see:

[...]
  File "/home/user/tmp/run.py", line xxx, in xxx
    writer.append('file2.pdf')
  File "/home/user/tmp//lib/python3.11/site-packages/pypdf/_writer.py", line 2621, in append
    self.merge(
  File "/home/user/tmp//lib/python3.11/site-packages/pypdf/_writer.py", line 2753, in merge
    _process_named_dests(dest)
  File "/home/user/tmp//lib/python3.11/site-packages/pypdf/_writer.py", line 2724, in _process_named_dests
    cast(DictionaryObject, self._root_object["/Names"])["/Dests"],
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/home/user/tmp//lib/python3.11/site-packages/pypdf/generic/_data_structures.py", line 478, in __getitem__
    return dict.__getitem__(self, key).get_object()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: '/Dests'