BUG: check whether self._info is not None before accessing its indirect_reference property

[djangovanderheijden]

I ran into the following error whilst compressing identical objects for a specific input PDF:

AttributeError: 'NoneType' object has no attribute 'indirect_reference'

After taking a closer look, it seems self._info is usually checked for None throughout the code in _writer.py. This one specific line seems to have slipped through the cracks.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.72%. Comparing base (ffd406a) to head (d0d9608).

Files with missing lines	Patch %	Lines
pypdf/_writer.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3349      +/-   ##
==========================================
- Coverage   96.73%   96.72%   -0.02%     
==========================================
  Files          53       53              
  Lines        9064     9065       +1     
  Branches     1676     1677       +1     
==========================================
  Hits         8768     8768              
  Misses        177      177              
- Partials      119      120       +1     

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[stefan6419846]

Thanks for the PR. Please add a corresponding test as well.

[djangovanderheijden]

Unfortunately I don't have the time to set up and figure out unit testing at this moment. The change is simple enough, so if someone could jump in and help out that'd be great. :)