[gnome-characters] categoryList: Make IBus detection robuster

[Daiki Ueno <dueno src gnome org>]

commit a28eb5fec0c0eeca2d67616f10da2a22ab25ad1a
Author: Daiki Ueno <dueno src gnome org>
Date:   Tue Jul 4 15:11:42 2017 +0200

    categoryList: Make IBus detection robuster

 src/categoryList.js |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/src/categoryList.js b/src/categoryList.js
index 6d9446e..4e186af 100644
--- a/src/categoryList.js
+++ b/src/categoryList.js
@@ -171,11 +171,14 @@ const CategoryListWidget = new Lang.Class({
 
         ibus.init();
         let bus = new ibus.Bus();
-        bus.list_engines_async(-1,
-                               null,
-                               Lang.bind(this, function (bus, res) {
-                                   this._finishListEngines(sources, bus, res);
-                               }));
+        if (bus.is_connected()) {
+            bus.list_engines_async(-1,
+                                   null,
+                                   Lang.bind(this, function (bus, res) {
+                                       this._finishListEngines(sources, bus, res);
+                                   }));
+        } else
+            this._finishBuildScriptList(sources);
     },
 
     _finishBuildScriptList: function(sources) {