fix: handle empty start command for cnb apps
fix: handle empty start command for cnb apps

We should instead fetch the command from the Procfile.

claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,dokku/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,dokku/dokku,dokku/dokku,progrium/dokku,dokku/dokku,dokku/dokku,dokku/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku