bugfix: go-to-step crashed if line before highlighted story line was blank ("".strip! returns nil)
bugfix: go-to-step crashed if line before highlighted story line was blank ("".strip! returns nil)

Signed-off-by: Ben Mabey <73675debcd8a436be48ec22211dcf44fe0df0a64@benmabey.com>
cowboyd/cucumber-tmbundle,cucumber/cucumber-tmbundle,bmabey/cucumber-tmbundle,AlpanaKumari/cucumber-tmbundle,cucumber/cucumber-tmbundle,vladimirkl/cucumber-sublime2-bundle,AlpanaKumari/cucumber-tmbundle