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Form.cc: fix crash when editing form field

Nelson Benítez León requested to merge nbenitez/poppler:edit_form_field_crash into master

defaultResources->lookupFont() may return nullptr when it cannot find the font, so handle that.

Crash happens in both Evince and Okular.

Please check out Evince issue for reproducer file and stacktrace (thanks Simon McFarlane):
https://gitlab.gnome.org/GNOME/evince/-/issues/1796

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