Description of problem:
Error "Couldn't connect to the server: undefined method `to_sym' for nil:NilClass
" while running server-ping.

Version-Release number of selected component (if applicable):
- Satellite 6.8.0 snap 6
- rubygem-foreman_maintain-0.6.5-1.el7sat.noarch

How reproducible:
- Always

Steps to Reproduce:
1. Run "foreman-maintain health check --label server-ping"

Actual results:
foreman-maintain health check --label server-ping
Running ForemanMaintain::Scenario::FilteredScenario
================================================================================
Check whether all services are running using the ping call:           [FAIL]
Couldn't connect to the server: undefined method `to_sym' for nil:NilClass
--------------------------------------------------------------------------------
Continue with step [Restart applicable services]?, [y(yes), n(no), q(quit)] y
Restart applicable services:                                                    

Stopping the following service(s):
rh-mongodb34-mongod, postgresql, qdrouterd, qpidd, rh-redis5-redis, squid, pulp_celerybeat, pulp_resource_manager, pulp_streamer, pulp_workers, smart_proxy_dynflow_core, tomcat, dynflow-sidekiq@orchestrator, foreman, httpd, puppetserver, dynflow-sidekiq@worker, dynflow-sidekiq@worker-hosts-queue, foreman-proxy
- stopping foreman                                                              
Warning: Stopping foreman.service, but it can still be activated by:
  foreman.socket
| All services stopped                                                          

Starting the following service(s):
rh-mongodb34-mongod, postgresql, qdrouterd, qpidd, rh-redis5-redis, squid, pulp_celerybeat, pulp_resource_manager, pulp_streamer, pulp_workers, smart_proxy_dynflow_core, tomcat, dynflow-sidekiq@orchestrator, foreman, httpd, puppetserver, dynflow-sidekiq@worker, dynflow-sidekiq@worker-hosts-queue, foreman-proxy
- All services started                                                          
/ Try 1/5: checking status of hammer ping                                       
Couldn't connect to the server: undefined method `to_sym' for nil:NilClass
/ Try 2/5: checking status of hammer ping                                       
Couldn't connect to the server: undefined method `to_sym' for nil:NilClass
| Try 3/5: checking status of hammer ping                                       
Couldn't connect to the server: undefined method `to_sym' for nil:NilClass
| Try 4/5: checking status of hammer ping                                       
Couldn't connect to the server: undefined method `to_sym' for nil:NilClass
| Try 5/5: checking status of hammer ping                             [FAIL]    
Server response check failed!
--------------------------------------------------------------------------------
Rerunning the check after fix procedure
Check whether all services are running using the ping call:           [FAIL]
Couldn't connect to the server: undefined method `to_sym' for nil:NilClass
--------------------------------------------------------------------------------
Continue with step [Restart applicable services]?, [y(yes), n(no), q(quit)] n
Continue with step [Restart applicable services]?, [y(yes), n(no), q(quit)] q
Scenario [ForemanMaintain::Scenario::FilteredScenario] failed.                  

The following steps ended up in failing state:

  [server-ping]

Resolve the failed steps and rerun
the command. In case the failures are false positives,
use --whitelist="server-ping"



Expected results:
Server-ping should work properly.

Additional info: