Output on valid request in Unsubscribe action is empty body: `{}`

[stas-fomenko]

Description: It is not obvious that email was unsubscribed when output is - {}

STR:

1. create flow: step1 - simple trigger
2. Add step2: mailchimp-component:Add new Subscriber - add new test Subscriber
3. add step3: mailchimp-component:Unsubscribe - use email of created Subscriber from step2
4. See output after sample retrieved on step3: {}

AR: Output {}
ER: Need to research API docs to find out what we can provide user with in order to understand that action was run with success.