D24696: don't crash on nullptr pdfOptionsPage

[Harald Sitter]

sitter created this revision.
Herald added a project: Okular.
Herald added a subscriber: okular-devel.
sitter requested review of this revision.

REVISION SUMMARY
  same as in fbeff5ae7c2b27577d829839879b0966b5a3859a <https://phabricator.kde.org/R223:fbeff5ae7c2b27577d829839879b0966b5a3859a> there may not be
  a pdfOptionsPage when using print preview.
  
  this fixes an exciting crash on our windows build when trying to print
  preview

TEST PLAN
  can't easily build on windows but the traceback definitely falls over 0x0000 on that line, so given context I am confident this fixes the crash

REPOSITORY
  R223 Okular

BRANCH
  Applications/19.08

REVISION DETAIL
  https://phabricator.kde.org/D24696

AFFECTED FILES
  generators/poppler/generator_pdf.cpp

To: sitter
Cc: okular-devel, johnzh, andisa, siddharthmanthan, maguirre, fbampaloukas, joaonetto, kezik, tfella, ngraham, darcyshen, aacid
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