[evolution-ews] Bug #708309 - Crash accessing GAL not marked for offline

[Milan Crha <mcrha src gnome org>]

commit c8d49fea5fd75ce251fe0919d70e5f861a127f42
Author: Milan Crha <mcrha redhat com>
Date:   Mon Sep 23 17:48:24 2013 +0200

    Bug #708309 - Crash accessing GAL not marked for offline

 src/addressbook/e-book-backend-ews.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/addressbook/e-book-backend-ews.c b/src/addressbook/e-book-backend-ews.c
index ca54ee9..993cb1f 100644
--- a/src/addressbook/e-book-backend-ews.c
+++ b/src/addressbook/e-book-backend-ews.c
@@ -2472,6 +2472,8 @@ ebews_start_gal_sync (gpointer data)
        ews_settings = book_backend_ews_get_collection_settings (cbews);
        priv = cbews->priv;
 
+       g_return_val_if_fail (priv->summary != NULL, FALSE);
+
        cancellable = g_object_ref (priv->cancellable);
 
        oab_cnc = e_ews_connection_new (priv->oab_url, ews_settings);
@@ -3142,11 +3144,11 @@ delta_thread (gpointer data)
        g_mutex_unlock (&priv->dlock->mutex);
 
        while (TRUE)    {
-               gboolean succeeded;
+               gboolean succeeded = TRUE;
 
                if (!priv->is_gal)
                        succeeded = ebews_start_sync (ebews);
-               else
+               else if (priv->summary)
                        succeeded = ebews_start_gal_sync (ebews);
 
                g_mutex_lock (&priv->dlock->mutex);