[gtk+] GtkFontButton: Avoid criticals

[Matthias Clasen <matthiasc src gnome org>]

commit 59fc2f0ac107c9affe63c9e5c26b9dee049ad424
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Aug 15 15:15:45 2014 -0400

    GtkFontButton: Avoid criticals
    
    The font_family and font_face members may be NULL, and we
    shouldn't cause critical warnings in that case.

 gtk/gtkfontbutton.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkfontbutton.c b/gtk/gtkfontbutton.c
index cb0822f..867d82f 100644
--- a/gtk/gtkfontbutton.c
+++ b/gtk/gtkfontbutton.c
@@ -1146,8 +1146,14 @@ gtk_font_button_update_font_info (GtkFontButton *font_button)
   const gchar *face_name;
   gchar *family_style;
 
-  fam_name = pango_font_family_get_name (priv->font_family);
-  face_name = pango_font_face_get_face_name (priv->font_face);
+  if (priv->font_family)
+    fam_name = pango_font_family_get_name (priv->font_family);
+  else
+    fam_name = _("None");
+  if (priv->font_face)
+    face_name = pango_font_face_get_face_name (priv->font_face);
+  else
+    face_name = "";
 
   if (priv->show_style)
     family_style = g_strconcat (fam_name, " ", face_name, NULL);