Harri

`GET /_matrix/federation/v1/query/profile` response violates OpenAPI schema

1

https://spec.matrix.org/v1.11/server-server-api/#get_matrixfederationv1queryprofile states that the response fields `avatar_url` and `displayname` shall be either `string` valued or omitted altogether, but never `null`. The code at https://github.com/element-hq/synapse/blob/44ae5362fd952dbb209f4b52ee9c96641163f032/synapse/handlers/profile.py#L539C1-L546C1 however leaks through `NULL` values from...