position field may not be set when we get to this point and
try to retrieve the value of a different field than the one
we're processing. Don't cause a new exception in that case.
- Legacy-Id: 6416
review decisions. Add migration to split up iesg_approve/disapprove
events of the form "IESG has approved ... and state has been changed
..." into the approve/disapprove event and a synthesized state change
event. Also regularize the descriptions a bit. This simplifies the
code in the new page.
- Legacy-Id: 6340
