page margins shouldn't negative, so clamp them to >= 0 on import. Signed-off-by: Caolán McNamara <caolan.mcnamara@collabora.com> Change-Id: Idbc180c1e7d710f9b655a188d41a1c573c28fb14 Reviewed-on: https://gerrit.collaboraoffice.com/c/online/+/3568 Reviewed-by: Noel Grandin <noel.grandin@collabora.com> Tested-by: Jenkins CPCI <releng@collaboraoffice.com> (cherry picked from commit e79cf4ad2adc9ed5bafdec2c23630471cb789e19) Reviewed-on: https://gerrit.libreoffice.org/c/core/+/205869 Tested-by: Xisco Fauli <xiscofauli@libreoffice.org> Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>