Don’t warn on expected WiiM getMetaInfo → Failed response

[hildebrau]

Don’t warn on expected WiiM getMetaInfo → Failed response

Summary

Follow-up to #91 / #93.

WiiM devices return the plain text Failed (HTTP 200, not JSON) for getMetaInfo when idle / no track metadata. While playing, the same endpoint returns normal JSON (metaData with title/artist/art, etc.).

#93 correctly handles this in bridge.py by catching LinkPlayInvalidDataException when exc.data == "Failed" and clearing metainfo. That prevents crashes — but session_call_api_json in utils.py still logs a warning before raising:

LOGGER.warning("Unexpected json for %s: %s", url, jsonexc)

In Home Assistant (local polling ~every 5s), an idle WiiM therefore spams:

WARNING [linkplay] Unexpected json for https://…/httpapi.asp?command=getMetaInfo: Expecting value: line 1 column 1 (char 0)

Once playback starts and getMetaInfo returns JSON again, the warnings stop.

Proposed change

Treat bare Failed as an expected non-JSON payload: keep raising LinkPlayInvalidDataException(data=result) so existing bridge handling still works, but log at debug (or skip logging) instead of warning when result == "Failed".

Still warn for other unexpected non-JSON responses.

Repro

1. WiiM idle / stopped — GET /httpapi.asp?command=getMetaInfo → Failed
2. Start playback on the same device → valid JSON metaData object
3. Observe HA / linkplay logs: warning every poll while idle; quiet while playing

Tested on

• Device: WiiM Pro (firmware Linkplay.4.8.814756)
• Library: python-linkplay 0.2.14 (via Home Assistant 2026.7.4 after JUST upgrading to new HA container)

Note

#93 fixed the crash; this removes the residual log noise for the same expected WiiM idle response.