"show authentication sessions" returns "Parser Output is empty" when "No sessions currently exist" cli output is returned from device.

[czinu]

Description

When there are no authentication sessions, this is when CLI outputs:

access-switch-01#show authentication sessions
No sessions currently exist

Unable to parse output for command 'show authentication sesssions" (Parser Output is empty) error is returned.

Motivation and Context

Return proper response when authentication service is not enabled or there are currently no active sessions.

{
    "interfaces": {

    },
    "session_count": 0
}

Ansible failed run:

fatal: [access-switch-01]: FAILED! =>
  msg: Unable to parse output for command 'show authentication sessions' (Parser Output is empty)

Ansible successful run:

ok: [access-switch-01] =>
  msg:
    show_authentication_sessions:
      interfaces: {}
      session_count: 0

[ThomasJRyan]

While we do appreciate the contribution, it does kind of go against how we prefer to structure our parsers. The error you're encountering is intended. Is there perhaps a middle ground we can reach?