text: Fix font fallback
text: Fix font fallback

Spotted by Coverity.

https://bugzilla.gnome.org/show_bug.cgi?id=689496

Distrotech/clutter,GNOME/clutter,djdeath/clutter-android,djdeath/clutter-android,heysion/clutter-clone,Distrotech/clutter,collects/clutter,heysion/clutter-clone,Distrotech/clutter,jigpu/clutter,heysion/clutter-clone,djdeath/clutter,GNOME/clutter,Distrotech/clutter,djdeath/clutter,jigpu/clutter,ebassi/clutter,djdeath/clutter-android,djdeath/clutter,djdeath/clutter-android,GNOME/clutter,Distrotech/clutter,heysion/clutter-clone,djdeath/clutter-android,heysion/clutter-clone,ebassi/clutter,jigpu/clutter,jigpu/clutter,collects/clutter,GNOME/clutter,djdeath/clutter,djdeath/clutter,ebassi/clutter,ebassi/clutter,collects/clutter,collects/clutter,collects/clutter,jigpu/clutter,jigpu/clutter,GNOME/clutter,Distrotech/clutter,ebassi/clutter,djdeath/clutter