spec: 2887215 close date defaults to end date
spec: 2887215 close date defaults to end date

Change-Id: I9c92993c06d8670ac90eba0145028328db40d395
Reviewed-on: https://gerrit.instructure.com/91859
Tested-by: Jenkins
Reviewed-by: Robert Lamb <bf934bf7cdbebe5899399a138c0cb75c4d783999@instructure.com>
Product-Review: KC Naegle <9fbecd016338f9910821a8a5d5d0ae4fc9abfaa5@instructure.com>
QA-Review: KC Naegle <9fbecd016338f9910821a8a5d5d0ae4fc9abfaa5@instructure.com>

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