[FIX] mrp_operations: use list instead of record set for o2m

In v7, accessing a o2m returned a list of browse record while it returns a recordset in v8.
The method _move_pass expects a list so a manual conversion is required.
Fixes #1787

addons/mrp_operations/mrp_operations.py

@@ -289,7 +289,7 @@ class mrp_production(osv.osv):
         for po in self.browse(cr, uid, ids, context=context):
             if po.allow_reorder:
                 continue
-            todo = po.move_lines
+            todo = list(po.move_lines)
             dt = datetime.strptime(po.date_start,'%Y-%m-%d %H:%M:%S')
             while todo:
                 l = todo.pop(0)