[Integrated] RFR: 130: Integrating outdated PRs shows an empty error message

[Robin Westberg]

Changeset: 751ec38a
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2019-10-15 08:23:49 +0000
URL:       https://git.openjdk.java.net/skara/commit/751ec38a

130: Integrating outdated PRs shows an empty error message

Reviewed-by: ehelin

! bots/pr/src/main/java/org/openjdk/skara/bots/pr/IntegrateCommand.java
! bots/pr/src/main/java/org/openjdk/skara/bots/pr/PullRequestInstance.java
! bots/pr/src/main/java/org/openjdk/skara/bots/pr/SponsorCommand.java
! bots/pr/src/test/java/org/openjdk/skara/bots/pr/IntegrateTests.java
! bots/pr/src/test/java/org/openjdk/skara/bots/pr/SponsorTests.java