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Issue description: 

 rh0027l-10.0 + encountered this error when trying to run finish lab script:

student@workstation:~$ lab finish ssh-review
🤖 Running: lab finish ssh-review
FAIL Restoring password authentication on serverb
 - An unexpected error ocurred: encountered RSA key, expected OPENSSH key. 
 - Check /tmp/log/labs/ssh-review or use the 'lab logs' command for details.
Traceback (most recent call last):
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/bin/lab", line 12, in 
 sys.exit(main())
 ~~~~^^
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/click/core.py", line 1128, in _call_
 return self.main(*args, **kwargs)
 ~~~~~~~~~^^^^^^^^^^^^^^^^^
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/click/core.py", line 1053, in main
 rv = self.invoke(ctx)
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/click/core.py", line 1659, in invoke
 return _process_result(sub_ctx.command.invoke(sub_ctx))
 ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/click/core.py", line 1395, in invoke
 return ctx.invoke(self.callback, **ctx.params)
 ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/click/core.py", line 754, in invoke
 return __callback(*args, **kwargs)
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/labs/lab.py", line 378, in finish
 grading.prefinish()
 ~~~~~~~~~~~~~~~~~^^
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/labs/grading.py", line 44, in prefinish
 self.finish()
 ~~~~~~~~~~~^^
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/rh0027l/ssh-review.py", line 140, in finish
 run_command(
 ~~~~~~~~~~~^
 message="Restoring password authentication on " + _serverb + "",
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 ...<6 lines>...
 on...'; fi",
 ^^^^^^^^^^^^
 ),
 ^
 File "/home/student/.cache/uv/archive-v0/XPQ8KJD5mIUJGM54KkpRQ/lib/python3.13/site-packages/labs/common/commands/_init_.py", line 52, in ssh_run_command_step
 return process, step
 ^^^^^^^
UnboundLocalError: cannot access local variable 'process' where it is not associated with a value 

Steps to reproduce:

Workaround:

Expected result: