[evolution] Bug #678606 - Crash under mail_backend_folder_deleted_cb()

[Milan Crha <mcrha src gnome org>]

commit 09893a473bebc1a1e607aedd12245f735d93deff
Author: Milan Crha <mcrha redhat com>
Date:   Mon Dec 3 12:05:39 2012 +0100

    Bug #678606 - Crash under mail_backend_folder_deleted_cb()

 mail/e-mail-backend.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/mail/e-mail-backend.c b/mail/e-mail-backend.c
index fcb99ed..2705520 100644
--- a/mail/e-mail-backend.c
+++ b/mail/e-mail-backend.c
@@ -454,6 +454,9 @@ mail_backend_folder_deleted_cb (MailFolderCache *folder_cache,
 			e_source_mail_composition_get_drafts_folder (
 			E_SOURCE_MAIL_COMPOSITION (extension));
 
+		if (!drafts_folder_uri)
+			continue;
+
 		if (class->equal_folder_name (drafts_folder_uri, uri)) {
 			GError *error = NULL;