[gnome-characters/wip/properties: 13/14] libgc, character: Check if detail info is non-null

[Daiki Ueno <dueno src gnome org>]

commit 71496ce1f3463569dad98c5b70a7412552f55daf
Author: Daiki Ueno <dueno src gnome org>
Date:   Tue Feb 10 18:26:27 2015 +0900

    libgc, character: Check if detail info is non-null

 lib/gc.c         |    8 ++++++++
 src/character.js |   15 ++++++++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)
---
diff --git a/lib/gc.c b/lib/gc.c
index 2607325..b718e7c 100644
--- a/lib/gc.c
+++ b/lib/gc.c
@@ -426,6 +426,10 @@ const gchar *
 gc_character_script (gunichar uc)
 {
   const uc_script_t *script = uc_script (uc);
+
+  if (!script)
+      return NULL;
+
   return script->name;
 }
 
@@ -439,6 +443,10 @@ const gchar *
 gc_character_block (gunichar uc)
 {
   const uc_block_t *block = uc_block (uc);
+
+  if (!block)
+      return NULL;
+
   return block->name;
 }
 
diff --git a/src/character.js b/src/character.js
index 65e8584..a973913 100644
--- a/src/character.js
+++ b/src/character.js
@@ -148,9 +148,18 @@ const CharacterDialog = new Lang.Class({
 
         this._codepoint_label.label =
             _("U+%04s").format(Util.hexCodepoint(uc));
-        this._category_label.label = Gettext.gettext(Gc.character_category(uc));
-        this._script_label.label = Gettext.gettext(Gc.character_script(uc));
-        this._block_label.label = Gettext.gettext(Gc.character_block(uc));
+
+        let category = Gc.character_category(uc);
+        this._category_label.label =
+            category ? Gettext.gettext(category) : _("Unknown");
+
+        let script = Gc.character_script(uc);
+        this._script_label.label =
+            script ? Gettext.gettext(script) : _("Unknown");
+
+        let block = Gc.character_block(uc);
+        this._block_label.label =
+            block ? Gettext.gettext(block) : _("Unknown");
 
         this._detail_grid.remove_row(4);
         let result = Gc.character_decomposition(uc);