fix: unknown type problem loading PDF

[jeremythuon]

When we set a parameter that is not a string, Path or BytesIO in load(). We get an error like this:

File “/data/zeromq/lib64/python3.9/site-packages/docling_parse/pdf_parser.py”, line 624, in load
if success:
UnboundLocalError: local variable ‘success’ referenced before assignment

With my fix:

File "/data/zeromq/lib64/python3.9/site-packages/docling_parse/pdf_parser.py", line 639, in load
raise RuntimeError(f"Receive path_or_stream type: {type(path_or_stream)}, only support string, Path or BytesIO")
RuntimeError: Receive path_or_stream type: <class 'bytes'>, only support string, Path or BytesIO

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[PeterStaar-IBM]

lgtm!