[MERGE] lp:920841 (stock: fix bug in upstream traceability)

bzr revid: rco@openerp.com-20120130141711-0osbxi8igon9v6d3

addons/stock/wizard/stock_traceability.py

@@ -47,7 +47,8 @@ class action_traceability(osv.osv_memory):
         obj = self.pool.get('stock.move')
         ids = obj.search(cr, uid, [(field, 'in',lot_id)])
         cr.execute('select id from ir_ui_view where model=%s and field_parent=%s and type=%s', ('stock.move', type1, 'tree'))
-        view_id = cr.fetchone()[0]
+        view_ids = cr.fetchone()
+        view_id = view_ids and view_ids[0] or False
         value = {
             'domain': "[('id','in',["+','.join(map(str, ids))+"])]",
             'name': ((type1=='move_history_ids2') and _('Upstream Traceability')) or _('Downstream Traceability'),