Adding step functions to existing project fails with undefined error #35
Description
I'm updating to v1.0.0 and I hit an error where its trying to, presumably, update step functions in an existing stack that I have previously deployed but the step functions don't yet exist in that stack.
Type Error ---------------------------------------------
Cannot read property 'forEach' of undefined
For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.
Stack Trace --------------------------------------------
TypeError: Cannot read property 'forEach' of undefined
at _.forEach (/Users/justin/code/input-system/node_modules/serverless-step-functions/lib/index.js:140:29)
at arrayEach (/Users/justin/code/input-system/node_modules/lodash/lodash.js:537:11)
at Function.forEach (/Users/justin/code/input-system/node_modules/lodash/lodash.js:9359:14)
at ServerlessStepFunctions.display (/Users/justin/code/input-system/node_modules/serverless-step-functions/lib/index.js:138:7)
at runCallback (timers.js:637:20)
at tryOnImmediate (timers.js:610:5)
at processImmediate [as _immediateCallback] (timers.js:582:5)
From previous event:
at PluginManager.invoke (/Users/justin/code/input-system/node_modules/serverless/lib/classes/PluginManager.js:210:22)
at PluginManager.run (/Users/justin/code/input-system/node_modules/serverless/lib/classes/PluginManager.js:225:17)
at Serverless.run (/Users/justin/code/input-system/node_modules/serverless/lib/Serverless.js:97:31)
at serverless.init.then (/Users/justin/code/input-system/node_modules/serverless/bin/serverless:23:50)