Description of problem:
if playbook has directive 'hosts: localhost' execution crash and below error is logged in '/var/log/foreman-proxy/smart_proxy_dynflow_core.log' 
~~~~
2021-07-14T13:48:51  [E] error while dispatching request to runner 13bfe0aa-9733-45f6-8e6d-e5df1ad83346:NoMethodError undefined method `add_output' for nil:NilClass:
~~~


Version-Release number of selected component (if applicable):


How reproducible:
every-time 

Steps to Reproduce:
1. add playbook on the satellite with below directive
~~~
- name: XYZ
  hosts: localhost
~~~
2. execute job for client server. 


Actual results:
responsible task goes in pending state and error logged smart_proxy_dynflow_core.log
~~~
error while dispatching request to runner 
~~~

- satellite will have defunct process for ansible 
~~~
# ps -aux | grep ansible 
foreman+ 31033  0.0  0.0      0     0 ?        Zs   Jul14   0:00 [ansible-runner] <defunct>
~~~

Expected results:
localhost should be acceptable for category 'hosts'

Additional info:

reference links > - https://github.com/theforeman/foreman_ansible/pull/391
                  - https://github.com/theforeman/foreman_ansible/pull/398