fix(rust): improve ockam relay list display when local state is empty

[k1nho]

Current behavior

Fixes #6144

$ ockam relay list returns an immediate error Unable to find node name default when the local state is empty, after running a command like $ ockam reset -y.

Proposed changes

This PR improves the user experience by handling the error when the local state is empty and displaying that there are no relays. Running $ ockam relay list on an empty local state will now yield the following.

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[adrianbenavides]

Hi @k1nho, thanks for submitting this PR! Your solution is valid, but there is a way to achieve the same result without adding extra code to the command impementation: take a look at the tcp-inlet list as an example. By running the initialize_node_if_default function before executing the run_impl you make sure at least the default node is up. The command will be able to handle the empty response, returning somthing like:

$ ockam relay list

       ┌────────────────────────────────────┐
       │       Relays on Node default       │
       └────────────────────────────────────┘

     ! No Relays found on node default.

[k1nho]

Hi @adrianbenavides, thanks for the feedback! good to know there is a useful helper for this case.

[adrianbenavides]

Thanks @k1nho for your contribution 🙏
It will get merged ASAP 🚀