GNOME Font VIewer does not show TTF font

[Norbert]

Steps to reproduce:
1. Install `gnome-font-viewer`
2. Download TTF font (for example Symbol from https://raw.githubusercontent.com/IamDH4/ttf-wps-fonts/master/symbol.ttf )
3. Try to open downloaded font with `gnome-font-viewer symbol.ttf`

Actual results:
GNOME Font Viewer shows blank white window (see screenshot). Terminal output is empty, .xsession-errors is clean.

Expected results:
GNOME Font Viewer shows font preview.

Note: the font file is not damaged, it opens normally with `mate-font-viewer`.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-font-viewer 3.26.0-1
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Jan 23 14:14:09 2018
InstallationDate: Installed on 2017-12-23 (30 days ago)
InstallationMedia: Ubuntu-MATE 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: gnome-font-viewer
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.