Cannot read property 'length' of undefined on data.StackEvents

[mick]

Looks like data.StackEvents can be undefined, and not have a error set

/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/request.js:30
            throw err;
                  ^
TypeError: Cannot read property 'length' of undefined
    at Response.<anonymous> (/usr/local/lib/node_modules/mapbox-cli/node_modules/cfn-stack-event-stream/index.js:27:49)
    at Request.<anonymous> (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/request.js:353:18)
    at Request.callListeners (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
    at Request.emit (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
    at Request.emit (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/request.js:595:14)
    at Request.transition (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/request.js:21:10)
    at AcceptorStateMachine.runTo (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/state_machine.js:14:12)
    at /usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/state_machine.js:26:10
    at Request.<anonymous> (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/request.js:37:9)
    at Request.<anonymous> (/usr/local/lib/node_modules/mapbox-cli/node_modules/aws-sdk/lib/request.js:597:12)