[libgdata] Bug 589265 – Crash on query error

[Philip Withnall <pwithnall src gnome org>]

commit 9b67a37d9af5f0200b7da6c49e3ae494ac4a995a
Author: Philip Withnall <philip tecnocode co uk>
Date:   Tue Jul 21 19:23:54 2009 +0100

    Bug 589265 â?? Crash on query error

 gdata/gdata-service.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gdata/gdata-service.c b/gdata/gdata-service.c
index 3beac2c..17940ff 100644
--- a/gdata/gdata-service.c
+++ b/gdata/gdata-service.c
@@ -1037,8 +1037,10 @@ gdata_service_query (GDataService *self, const gchar *feed_uri, GDataQuery *quer
 	g_return_val_if_fail (entry_type != G_TYPE_INVALID, NULL);
 
 	message = _gdata_service_query (self, feed_uri, query, cancellable, progress_callback, progress_user_data, error);
-	g_assert (message->response_body->data != NULL);
+	if (message == NULL)
+		return NULL;
 
+	g_assert (message->response_body->data != NULL);
 	klass = GDATA_SERVICE_GET_CLASS (self);
 	feed = _gdata_feed_new_from_xml (klass->feed_type, message->response_body->data, message->response_body->length, entry_type,
 					 progress_callback, progress_user_data, error);