[FIX] unhandled multi selection of entries in wizard...

[FIX] unhandled multi selection of entries in wizard hr_timesheet_invoice/wizard/hr_timesheet_invoice_create.py

lp bug: https://launchpad.net/bugs/327120 fixed

bzr revid: qdp@tinyerp.com-20090209114521-723c5n6yykyde79k