[Integrated] RFR: Fix problem with finding a collapsed parent

[duke]

Changeset: 9e02b45e
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2019-09-20 13:02:54 +0000
URL:       https://git.openjdk.java.net/skara/commit/9e02b45e

Fix problem with finding a collapsed parent

Reviewed-by: ehelin

! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/ReviewArchive.java
! bots/mlbridge/src/test/java/org/openjdk/skara/bots/mlbridge/MailingListBridgeBotTests.java