[empathy] Fix crash if contact_id is NULL when selecting its color

[Xavier Claessens <xclaesse src gnome org>]

commit e3a4b93a1e7ec0fd3aa87818189bd87710645257
Author: Xavier Claessens <xclaesse gmail com>
Date:   Mon May 2 20:27:13 2011 +0200

    Fix crash if contact_id is NULL when selecting its color

 libempathy-gtk/empathy-theme-adium.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/libempathy-gtk/empathy-theme-adium.c b/libempathy-gtk/empathy-theme-adium.c
index 66ce033..5d43160 100644
--- a/libempathy-gtk/empathy-theme-adium.c
+++ b/libempathy-gtk/empathy-theme-adium.c
@@ -416,9 +416,10 @@ theme_adium_append_html (EmpathyThemeAdium *theme,
 			 * Incoming/SenderColors.txt it will be used instead of
 			 * the default colors.
 			 */
-			guint hash = g_str_hash (contact_id);
-
-			replace = colors[hash % G_N_ELEMENTS (colors)];
+			if (contact_id != NULL) {
+				guint hash = g_str_hash (contact_id);
+				replace = colors[hash % G_N_ELEMENTS (colors)];
+			}
 		} else if (theme_adium_match (&cur, "%senderStatusIcon%")) {
 			/* FIXME: The path to the status icon of the sender
 			 * (available, away, etc...)