Fix undefined application in the initializer (#227)
Fix undefined application in the initializer (#227)

* Fix runtime error in FastBoot (by @mhluska) 

* Replace 'const' with 'let' to pass eslint

Test by @proteamer:

npm install -g ember-cli@3.3.0
mkdir ember-test && cd ember-test
ember init
ember install ember-form-for
ember generate component hello-world
ember test

martndemus/ember-form-for,martndemus/ember-form-for