[Integrated] RFR: A generated webrev should always include index.html

[duke]

Changeset: 915f2092
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2019-09-20 13:03:21 +0000
URL:       https://git.openjdk.java.net/skara/commit/915f2092

A generated webrev should always include index.html

Reviewed-by: ehelin

! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/WebrevStorage.java