refactor

* use continue's on short paths to avoid nesting
* do not call 4 times getWorkflowsFor()
* when looking for triggers, only iterate through the list once





git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42492 20353a03-c40f-0410-a6d1-a30d3c3de9de