[evolution] Use default headers when none stored to display in mailer

[Milan Crha <mcrha src gnome org>]

commit f1eae39e4eeb41347f5559896f2fd724ffa67c01
Author: Milan Crha <mcrha redhat com>
Date:   Mon Apr 26 18:06:08 2010 +0200

    Use default headers when none stored to display in mailer
    
    As part of bug #603418, to fix a corner case

 mail/e-mail-reader-utils.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/mail/e-mail-reader-utils.c b/mail/e-mail-reader-utils.c
index 51912bb..fb823e5 100644
--- a/mail/e-mail-reader-utils.c
+++ b/mail/e-mail-reader-utils.c
@@ -697,8 +697,11 @@ headers_changed_cb (GConfClient *gconf, guint cnxn_id, GConfEntry *entry, EMailR
 		e_mail_reader_header_free (h);
 	}
 
-	g_slist_foreach(header_config_list, (GFunc) g_free, NULL);
-	g_slist_free(header_config_list);
+	if (!header_config_list)
+		em_format_default_headers (emf);
+
+	g_slist_foreach (header_config_list, (GFunc) g_free, NULL);
+	g_slist_free (header_config_list);
 
 	/* force a redraw */
 	if (emf->message)