Iss. #57 - Add check to skip validation if there are no new commits

Merged Martin Lowe requested to merge malowe/git-eca-rest-api:malowe/master/57 into master

Added Denis to list of usual suspects as this will be going up as the new Gitlab server hook. Adds a skip if there are no new commits to validate. Fixes the _nil message as that comes from the validation API

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