[Bug] found 2 bugs when pdf has no /Rotation, viewinfo

[baslr]

Hello,

we found 2 bugs in the library.
This line crashes when there is no /Rotation information in the pdf.

pdfrw/pdfrw/buildxobj.py

Line 294 in a9d498d

rotation = get_rotation(inheritable.Rotate)

And also this line crashes:

pdfrw/pdfrw/buildxobj.py

Line 295 in a9d498d

mbox, bbox = getrects(inheritable, viewinfo, rotation)

I added try catch and set default but this is just a temporary fix. Especially the defaults for the mbox are totally wrong when the pdf is horizontal oriented.

The company was so kind and generated a sharable pdf which contains the problem.

minimal example:

from io import BytesIO

from pdfrw import PageMerge
from pdfrw import PdfReader

in_file = open("Warenbewegungsschein_Test.pdf", "rb") # opening for [r]eading as [b]inary
data = in_file.read()
raw_pdf = BytesIO(data)
raw_pdf.seek(0)

srcpage = PdfReader(raw_pdf).pages
srcpage = PageMerge() + srcpage[0]

(line numbers may be not correct because of debugging)

python simple_test.py
Traceback (most recent call last):
  File "/home/manuel/dls-pdf-parser/pdf_merger/simple_test.py", line 17, in <module>
    srcpage = PageMerge() + srcpage[0]
  File "/home/manuel/dls-pdf-parser/venv/lib/python3.10/site-packages/pdfrw/pagemerge.py", line 169, in __add__
    self.add(item)
  File "/home/manuel/dls-pdf-parser/venv/lib/python3.10/site-packages/pdfrw/pagemerge.py", line 176, in add
    obj = RectXObj(obj)
  File "/home/manuel/dls-pdf-parser/venv/lib/python3.10/site-packages/pdfrw/pagemerge.py", line 56, in __init__
    base = pagexobj(page, viewinfo)
  File "/home/manuel/dls-pdf-parser/venv/lib/python3.10/site-packages/pdfrw/buildxobj.py", line 300, in pagexobj
    rotate = inheritable.Rotate
  File "/home/manuel/dls-pdf-parser/venv/lib/python3.10/site-packages/pdfrw/objects/pdfdict.py", line 19, in __getattr__
    return self[PdfName(name)]
  File "/home/manuel/dls-pdf-parser/venv/lib/python3.10/site-packages/pdfrw/objects/pdfdict.py", line 25, in __getitem__
    value = mydict[name]
TypeError: string indices must be integers

Warenbewegungsschein_Test.pdf