D24696: don't crash on nullptr pdfOptionsPage

[Albert Astals Cid]

aacid accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R223 Okular

BRANCH
  Applications/19.08

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

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