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When there were no accounts configured, watcher returned a cryptic error message containing 'null' in the description. This fix returns a more clear error message. On top a dedicated NotificationServiceTests class was added to remove redundant test cases in the hipchat/jira/slack unit tests, that all basically tested NotificationService capabilties. relates elastic/x-pack-elasticsearch#2666 Original commit: elastic/x-pack-elasticsearch@45d0d1df31