`oxide system hardware switch list` returns empty list

I am running a4x2 with the following combination of commits:

• omicron 6dd980251a26430466bcd5aff1edad5416cf94e5
• maghemite 242e67e1e6b363b9bae04c90920fb8f43ac0a51d
• oxnet 7dacd265f1bcd0f8b47bd4805250c4f0812da206

I am using the version of the Oxide CLI from https://github.com/oxidecomputer/oxide.rs/pull/795, with commit 6fbbd5568289e95432ed7adfb6808c3d3cd0e3f0:

$ oxide version
Oxide CLI 0.6.1+20240710.0
Built from commit: 6fbbd5568289e95432ed7adfb6808c3d3cd0e3f0 
Oxide API: 20240821.0

I ran the following command, and I was hoping to see values like switch0 and switch1, but I instead got an empty list.

$ oxide system hardware switch list
[]

I ran this command, but I don't understand the difference between switch_location and switch, and whether switch_location should appear in the output of the above command.

$ oxide system hardware switch-port list
[
  {
    "id": "<omitted>3761",
    "port_name": "qsfp1",
    "rack_id": "51becb40-1818-4ea0-b278-2af26bc8bbe4",
    "switch_location": "switch0"
  }, {
    "id": "<omitted>a494",
    "port_name": "qsfp0",
    "port_settings_id": "<omitted>6760",
    "rack_id": "51becb40-1818-4ea0-b278-2af26bc8bbe4",
    "switch_location": "switch0"
  }, {
    "id": "<omitted>f319",
    "port_name": "qsfp0",
    "port_settings_id": "<omitted>1775",
    "rack_id": "51becb40-1818-4ea0-b278-2af26bc8bbe4",
    "switch_location": "switch1"
  }, {
    "id": "<omitted>a6e1",
    "port_name": "qsfp1",
    "rack_id": "51becb40-1818-4ea0-b278-2af26bc8bbe4",
    "switch_location": "switch1"
  }

Reproduce oxide system hardware switch list using the Omicron, Maghemite, Oxnet, and Oxide CLI commits listed in the report. Compare its empty result with oxide system hardware switch-port list, focusing on how switch and switch_location are represented. Done when the command returns the expected switch values or the discrepancy is clearly documented and covered by an appropriate test.