Hello,

I think I've stumbled across a program-crashing issue.  On line 69 of 
PdfPage.cpp, there's a 'TODO: handle absent contents'; currently, by 
just setting m_pContents = NULL, PoDoFo will segfault when a method such 
as GetContents is called which dereferences the NULL pointer.
According to the PDF spec, "If [Contents] is absent, the page shall be 
empty."  So having a NULL m_pContents might be a reasonable way to 
handle the issue, but the rest of the code will need to test whether 
m_pContents is non-NULL before dereferencing it.  I'm not sure if 
there's a simple way to create an 'empty' PdfContents object as that 
would probably be a preferential solution in my opinion.
If an example document would be helpful, I can provide one, but it 
should be pretty simple to create one if necessary (just a blank PDF 
should do the trick).  I'd like to see this resolved because it doesn't 
seem like an extremely difficult issue and it does cause the library to 
segfault on valid PDFs.

Thanks,
Mike Slegeir

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