[gnome-color-manager] Don't crash and burn when there are no devices in the list

[Richard Hughes <rhughes src gnome org>]

commit 8482ad6d6fc2705e2e6b8ee0021a24ba3dd8703a
Author: Richard Hughes <richard hughsie com>
Date:   Thu Nov 5 13:49:43 2009 +0000

    Don't crash and burn when there are no devices in the list

 src/gcm-prefs.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/gcm-prefs.c b/src/gcm-prefs.c
index 1401919..4d92fd9 100644
--- a/src/gcm-prefs.c
+++ b/src/gcm-prefs.c
@@ -530,6 +530,10 @@ gcm_prefs_profile_combo_changed_cb (GtkWidget *widget, gpointer data)
 	active = gtk_combo_box_get_active (GTK_COMBO_BOX(widget));
 	egg_debug ("now %i", active);
 
+	/* no devices */
+	if (current_device == NULL)
+		return;
+
 	if (active < profiles_array->len)
 		filename = g_ptr_array_index (profiles_array, active);