be put in INVOKE_ERROR_STATE, but we will LOG a traceback (maybe we should
also call notifyUser).
remove the obsolete comment "what happens if read conflict error restarts
transaction", because this is handled explicitly here.



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13404 20353a03-c40f-0410-a6d1-a30d3c3de9de