[evolution-data-server] Avoid possible crash in source_parse_dbus_data()

[Milan Crha <mcrha src gnome org>]

commit 9cde12ff85bd1a2e0f2556cb2a1928bfced3d864
Author: Milan Crha <mcrha redhat com>
Date:   Mon Mar 23 14:03:39 2015 +0100

    Avoid possible crash in source_parse_dbus_data()

 libedataserver/e-source.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libedataserver/e-source.c b/libedataserver/e-source.c
index ad68a64..0106bd5 100644
--- a/libedataserver/e-source.c
+++ b/libedataserver/e-source.c
@@ -937,6 +937,9 @@ source_parse_dbus_data (ESource *source,
        gchar *data;
        gboolean success;
 
+       if (!source->priv->dbus_object)
+               return FALSE;
+
        dbus_object = E_DBUS_OBJECT (source->priv->dbus_object);
 
        dbus_source = e_dbus_object_get_source (dbus_object);