Page merge: 'NullObject' object has no attribute 'get_data' #2157
Description
Applying the fix from #2150 on the existing code and using a PDF where remove_text() and remove_images() have been called on raises an error.
Environment
Which environment were you using when you encountered the problem?
$ python -m platform
Linux-5.14.21-150400.24.81-default-x86_64-with-glibc2.31
$ python -c "import pypdf;print(pypdf._debug_versions)"
pypdf==3.15.5, crypt_provider=('pycryptodome', '3.18.0'), PIL=10.0.0Code + PDF
This is a minimal, complete example that shows the issue:
from pypdf import PdfReader, PdfWriter
watermark = PdfReader("watermark.pdf").pages[0]
pdf_file = PdfWriter(clone_from="file.pdf")
for page in pdf_file.pages:
page.merge_page(watermark, over=True)The watermark is https://github.com/py-pdf/pypdf/files/12428857/watermark.pdf, the cleaned file abc.pdf
Traceback
This is the complete traceback I see:
Traceback (most recent call last):
File "/home/stefan/temp/pdf/run1.py", line 7, in <module>
page.merge_page(watermark, over=True)
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/_page.py", line 1044, in merge_page
self._merge_page(page2, over=over, expand=expand)
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/_page.py", line 1124, in _merge_page
original_content = self.get_contents()
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/_page.py", line 955, in get_contents
return ContentStream(self[PG.CONTENTS].get_object(), pdf)
File "/home/stefan/temp/venv/lib/python3.9/site-packages/pypdf/generic/_data_structures.py", line 1021, in __init__
stream_data = stream.get_data()
AttributeError: 'NullObject' object has no attribute 'get_data'