[poppler] c++ interface segfaults for invalid password

[Jeroen Ooms]

If the user enters an incorrect password when reading a protected pdf via
document::load_from_raw_data() an error is printed to stdout

 error: Incorrect password

However the load_from_raw_data() does not raise an exception and returns a
valid *document. However this document segfaults when we call for
example doc->pages().

I would have expected that load_from_raw_data() raises an exception instead
of just printing "incorrect password"?

If this is intended, what property of *document should I check to see if
document::load_from_raw_data() was successful?
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