JSONDecodeError when trying to interact with user in a non-healthy server

We got a small federation running for Raiden Network, and because of some disk full issue, one of the servers crashed. Following it, the healthy ones started returning some unexpected responses for interactions with users on the healthy ones.
E.g. trying to invite an user in the unhealthy server to a room in the healthy one, the invite request returned:

<Response [429]>
{"errcode":"M_UNKNOWN","error":"Unknown Status"}

but from
https://github.com/matrix-org/matrix-python-sdk/blob/e366d52850f2bd948e9613022b735054616cfe0b/matrix_client/api.py#L731-L735
if the error isn't a json, json.JSONDecodeError will be raised.
Quick fix is to add json.JSONDecodeError to the handled errors in L734
Full stack traces and context can be found in raiden-network/raiden#2603

Comienza en matrix_client/api.py, alrededor de las líneas 731–735, donde se analizan y gestionan las respuestas de error que no son JSON. Reproduce la respuesta 429 que contiene la carga útil de error mostrada y, a continuación, verifica que la interacción siga la ruta existente de errores gestionados sin lanzar JSONDecodeError.