I am working with a simple pipeline, just to get familiar with the system.  My pipeline is defined in the attached Jenkinsfile.  I can't seem to get the "Deploy" stage to work.  I am using the simple "when { branch 'master' }".  However I keep getting: Stage 'Deploy' skipped due to when conditional

NOTE: This is a single branch repo with only a master branch

Jenkins Version: 2.51

Pipeline Plugin Version: 2.5

Running on AWS Linux image. I followed this setup guide: https://aws.amazon.com/getting-started/projects/setup-jenkins-build-server/