fix(travis): validate TRAVIS_COMMIT if TRAVIS_PULL_REQUEST_SHA is not set. (#3094)
fix(travis): validate TRAVIS_COMMIT if TRAVIS_PULL_REQUEST_SHA is not set. (#3094)

Looks like the pre-merge travis run sets TRAVIS_PULL_REQUEST_SHA but the post-merge run does not.
In the post-merge the TRAVIS_COMMIT should be the PR, so validate it.
karma-runner/karma,johnjbarton/karma,david-garcia-nete/karma,karma-runner/karma,johnjbarton/karma,karma-runner/karma,maksimr/karma,david-garcia-nete/karma,johnjbarton/karma,maksimr/karma,johnjbarton/karma,maksimr/karma,david-garcia-nete/karma,karma-runner/karma