[aravis] viewer: exit if the UI file is missing.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit 28bdbc2fead51c81e8e120de11bfbb6d51713def
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Wed May 30 22:23:21 2012 +0200

    viewer: exit if the UI file is missing.

 viewer/arvviewer.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/viewer/arvviewer.c b/viewer/arvviewer.c
index a3537b9..f92cc66 100644
--- a/viewer/arvviewer.c
+++ b/viewer/arvviewer.c
@@ -577,7 +577,10 @@ arv_viewer_new (void)
 					"arv-viewer-2.ui",
 #endif
 					NULL);
-	gtk_builder_add_from_file (builder, ui_filename, NULL);
+
+	if (!gtk_builder_add_from_file (builder, ui_filename, NULL))
+		g_error ("The user interface file is missing ('%s')", ui_filename);
+
 	g_free (ui_filename);
 
 	viewer->camera_combo_box = GTK_WIDGET (gtk_builder_get_object (builder, "camera_combobox"));