[BUG] ssh_known_hosts.present excpetion when specified user not present

[boltronics]

Description Using the ssh_known_hosts.present state module with the - user: argument blows up with an unhelpful TypeError: string indices must be integers exception when the supplied user does not actually exist.

Setup No special setup required. Just specify a user that doesn't actually exist, and you'll get the following:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/salt/state.py", line 2154, in call
    *cdata["args"], **cdata["kwargs"]
  File "/usr/lib/python3/dist-packages/salt/loader.py", line 2106, in wrapper
    return f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/salt/states/ssh_known_hosts.py", line 177, in present
    fingerprint_hash_type=fingerprint_hash_type,
  File "/usr/lib/python3/dist-packages/salt/modules/ssh.py", line 1114, in set_known_host
    stored_keys = [h["key"] for h in stored_host_entries] if stored_host_entries else []
  File "/usr/lib/python3/dist-packages/salt/modules/ssh.py", line 1114, in <listcomp>
    stored_keys = [h["key"] for h in stored_host_entries] if stored_host_entries else []
TypeError: string indices must be integers

Steps to Reproduce the behavior

Add {{ host }} ({{ host_fqdn }}) SSH host-key to baduser known_hosts:
  ssh_known_hosts.present:
    - name: {{ host_fqdn }}
    - user: baduser
    - enc: ecdsa
    - fingerprint: '{{ fingerprint }}'
    - port: 22
    - fingerprint_hash_type: sha256

Everything works as expected if I replace "baduser" with the valid user "root", for example.

Expected behavior An error that the user does not exist.

Versions Report

salt --versions-report

(Provided by running salt --versions-report. Please also mention any differences in master/minion versions.)

Salt Version:
          Salt: 3002.8
 
Dependency Versions:
          cffi: Not Installed
      cherrypy: Not Installed
      dateutil: 2.7.3
     docker-py: Not Installed
         gitdb: 2.0.5
     gitpython: 2.1.11
        Jinja2: 2.10
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 0.5.6
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: Not Installed
      pycrypto: 2.6.1
  pycryptodome: 3.6.1
        pygit2: Not Installed
        Python: 3.7.3 (default, Jan 22 2021, 20:04:44)
  python-gnupg: 0.4.4
        PyYAML: 3.13
         PyZMQ: 17.1.2
         smmap: 2.0.5
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.1
 
System Versions:
          dist: debian 10 buster
        locale: UTF-8
       machine: x86_64
       release: 4.19.0-17-cloud-amd64
        system: Linux
       version: Debian GNU/Linux 10 buster

Additional context I could not tell what the issue was when I ran into this exception without some investigation, which are additional steps that should not be necessary.

Thanks.

[Ch3LL]

I'm able to confirm this behavior on the head of master.