[evolution-mapi] Bug #651709 - Crash on deselect in new calendar folder tree

[Milan Crha <mcrha src gnome org>]

commit bc49d37df1e1c9d96fe14889548ba7051e84808f
Author: Milan Crha <mcrha redhat com>
Date:   Fri Aug 19 13:03:58 2011 +0200

    Bug #651709 - Crash on deselect in new calendar folder tree

 .../exchange-mapi-account-setup.c                  |   16 +++++++++-------
 1 files changed, 9 insertions(+), 7 deletions(-)
---
diff --git a/src/account-setup-eplugin/exchange-mapi-account-setup.c b/src/account-setup-eplugin/exchange-mapi-account-setup.c
index 24fcbc7..7c77e8c 100644
--- a/src/account-setup-eplugin/exchange-mapi-account-setup.c
+++ b/src/account-setup-eplugin/exchange-mapi-account-setup.c
@@ -678,15 +678,17 @@ exchange_mapi_cursor_change (GtkTreeView *treeview, ESource *source)
 	GtkTreeModel     *model;
 	GtkTreeIter       iter;
 	mapi_id_t pfid;
-	gchar *sfid=NULL;
+	gchar *sfid = NULL;
 
 	selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));
-	gtk_tree_selection_get_selected(selection, &model, &iter);
-
-	gtk_tree_model_get (model, &iter, FID_COL, &pfid, -1);
-	sfid = exchange_mapi_util_mapi_id_to_string (pfid);
-	e_source_set_property (source, "parent-fid", sfid);
-	g_free (sfid);
+	if (gtk_tree_selection_get_selected (selection, &model, &iter)) {
+		gtk_tree_model_get (model, &iter, FID_COL, &pfid, -1);
+		sfid = exchange_mapi_util_mapi_id_to_string (pfid);
+		e_source_set_property (source, "parent-fid", sfid);
+		g_free (sfid);
+	} else {
+		e_source_set_property (source, "parent-fid", NULL);
+	}
 }
 
 static GtkWidget *