[evolution/gnome-3-16] Bug 747290 - Workaround crash under refresh_folders_exec(), g_str_hash()

[Milan Crha <mcrha src gnome org>]

commit 34f559a22f01ecc50e20a483de8b0e589b431129
Author: Milan Crha <mcrha redhat com>
Date:   Wed Jun 17 17:08:00 2015 +0200

    Bug 747290 - Workaround crash under refresh_folders_exec(), g_str_hash()

 mail/mail-send-recv.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/mail/mail-send-recv.c b/mail/mail-send-recv.c
index f4eebe4..9d6fd62 100644
--- a/mail/mail-send-recv.c
+++ b/mail/mail-send-recv.c
@@ -482,7 +482,8 @@ report_error_to_ui_cb (gpointer user_data)
                shell_content = e_shell_view_get_shell_content (shell_view);
                alert_sink = E_ALERT_SINK (shell_content);
 
-               alert = e_alert_new (data->error_ident, data->display_name, data->error->message, NULL);
+               alert = e_alert_new (data->error_ident, data->display_name,
+                       data->error->message ? data->error->message : _("Unknown error"), NULL);
 
                e_alert_sink_submit_alert (alert_sink, alert);
 
@@ -1266,7 +1267,9 @@ refresh_folders_exec (struct _refresh_folders_msg *m,
                        camel_folder_refresh_info_sync (folder, cancellable, &local_error);
 
                if (local_error != NULL) {
-                       if (g_hash_table_contains (known_errors, local_error->message)) {
+                       const gchar *error_message = local_error->message ? local_error->message : _("Unknown 
error");
+
+                       if (g_hash_table_contains (known_errors, error_message)) {
                                /* Received the same error message multiple times; there can be some
                                   connection issue probably, thus skip the rest folder updates for now */
                                g_clear_object (&folder);
@@ -1287,7 +1290,7 @@ refresh_folders_exec (struct _refresh_folders_msg *m,
                                report_error_to_ui (CAMEL_SERVICE (store), full_name, local_error);
 
                                /* To not report one error for multiple folders multiple times */
-                               g_hash_table_insert (known_errors, g_strdup (local_error->message), 
GINT_TO_POINTER (1));
+                               g_hash_table_insert (known_errors, g_strdup (error_message), GINT_TO_POINTER 
(1));
                        }
 
                        g_clear_error (&local_error);