[BUGFIX] Ensures initializer is optional in stage 1 (#323)
[BUGFIX] Ensures initializer is optional in stage 1 (#323)

Fixes #322 

Ideally we would have tests for this, but we'd have to bring back the TS1 style tests which were a huge pain..
rwjblue/ember-computed-decorators,rwjblue/ember-computed-decorators,rwjblue/ember-computed-decorators