[gnome-control-center] shell: Fix warning in renderer

[Bastien Nocera <hadess src gnome org>]

commit 6653f3276e3b450cbf987a5d5c57ef67f499c410
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Mar 7 17:54:57 2011 +0000

    shell: Fix warning in renderer

 shell/shell-search-renderer.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/shell/shell-search-renderer.c b/shell/shell-search-renderer.c
index 42368da..2bee82c 100644
--- a/shell/shell-search-renderer.c
+++ b/shell/shell-search-renderer.c
@@ -148,7 +148,10 @@ shell_search_renderer_set_layout (ShellSearchRenderer *cell, GtkWidget *widget)
 
   full_string = priv->search_target;
 
-  needle = g_utf8_casefold (priv->search_string, -1);
+  if (priv->search_string != NULL)
+    needle = g_utf8_casefold (priv->search_string, -1);
+  else
+    needle = NULL;
   haystack = g_utf8_casefold (full_string, -1);
 
   /* clear any previous attributes */