D15728: Try to avoid segfaults on shape factory not found

[Camilla Boemann]

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

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D15728

To: dcaliste, leinir, anthonyfieroni, danders, #calligra:_3.0, boemann
Cc: Calligra-Devel-list, dcaliste, cochise, vandenoever
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