Description of problem:
Changing the Capsule field post the curl command is generated during registration failed with an error.

"There was an error while generating the command, see the logs for more information."

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

How reproducible:
100%

Steps to Reproduce:
1. Go to Satellite WebUI > Hosts -> Register Host
2. Select Capsule parameter as capsule server FQDN, select other fields such as Host Group, Activation Key and then click on Generate
3. Once the Curl command is generated, change the capsule parameter again to default (Satellite) and regenerate the curl command by hitting Generate.

Actual results:
No Curl command generated again for host registration with satellite and throwing the following message-

"There was an error while generating the command, see the logs for more information."

Expected results:
After changing the Capsule parameter and hitting the Generate, another curl command should be created to register the host.

Additional info: