[evolution-ews] Fix crash in addressbook completion when no offline GAL cache

[David Woodhouse <dwmw2 src gnome org>]

commit 8c8e95209e1cafd01b49838fe8168345601d214b
Author: David Woodhouse <David Woodhouse intel com>
Date:   Wed Oct 19 22:19:53 2011 +0100

    Fix crash in addressbook completion when no offline GAL cache

 src/addressbook/e-book-backend-ews.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/addressbook/e-book-backend-ews.c b/src/addressbook/e-book-backend-ews.c
index 111f649..0f958d9 100644
--- a/src/addressbook/e-book-backend-ews.c
+++ b/src/addressbook/e-book-backend-ews.c
@@ -2067,7 +2067,8 @@ e_book_backend_ews_start_book_view (EBookBackend  *backend,
 
 	ebews_start_refreshing (ebews);
 
-	if (e_book_backend_sqlitedb_get_is_populated (priv->ebsdb, priv->folder_id, NULL)) {
+	if (priv->ebsdb &&
+	    e_book_backend_sqlitedb_get_is_populated (priv->ebsdb, priv->folder_id, NULL)) {
 		fetch_from_offline (ebews, book_view, query, error);
 		return;
 	}