It is not allowed, per coding style rules, to start a local variable name with an underscore. Found by pylint.
Fixes a bug introduced in r958 (variable renaming forgotten on "if" line).


git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@966 71dcc9de-d417-0410-9af5-da40c76e7ee4