[HarfBuzz] Failure in hb_font_get_nominal_glyph

[Eli Zaretskii]

> From: Behdad Esfahbod <behdad at behdad.org>
> Date: Thu, 25 Jul 2019 12:08:43 -0400
> Cc: Khaled Hosny <dr.khaled.hosny at gmail.com>, harfbuzz at lists.freedesktop.org
> 
> Looks good to me. 

Thanks!