[Integrated] RFR: Fix NPE in GitLabHost::isMemberOf

[duke]

Changeset: 70f9f001
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2019-10-04 07:30:30 +0000
URL:       https://git.openjdk.java.net/skara/commit/70f9f001

Fix NPE in GitLabHost::isMemberOf

Reviewed-by: rwestberg

! host/src/main/java/org/openjdk/skara/host/gitlab/GitLabHost.java