- calling the workflow when a line is added is premature, because
    the line is probably not set up correctly
  - _setResource* on the line will trigger the proper action later on
* correct typo on interaction name
* check that resource is not None



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33373 20353a03-c40f-0410-a6d1-a30d3c3de9de