BUG: append() fails when articles do not have /T (#2080)

/T is optional

Closes #2078

pypdf/_writer.py

@@ -3085,7 +3085,11 @@ def add_filtered_articles(
  for p in pages.values():
  pp = p.original_page
  for a in pp.get("/B", ()):
- thr = a.get_object()["/T"]
+ thr = a.get_object().get("/T")
+ if thr is None:
+ continue
+ else:
+ thr = thr.get_object()
  if thr.indirect_reference.idnum not in self._id_translated[
  id(reader)
  ] and fltr.search(thr["/I"]["/Title"]):

tests/test_writer.py

@@ -1589,3 +1589,13 @@ def test_missing_info():
 
  writer = PdfWriter(clone_from=reader)
  assert len(writer.pages) == len(reader.pages)
+
+
+@pytest.mark.enable_socket()
+def test_no_t_in_articles():
+ """Cf #2078"""
+ url = "https://github.com/py-pdf/pypdf/files/12311735/bad.pdf"
+ name = "iss2078.pdf"
+ reader = PdfReader(BytesIO(get_data_from_url(url, name=name)))
+ writer = PdfWriter()
+ writer.append(reader)