16773f5e4a
* Do not send empty auth when setting up cross-signing keys My understanding from the spec is that no auth parameter should be sent when starting a UIA flow. [This section](https://spec.matrix.org/v1.14/client-server-api/#user-interactive-api-in-the-rest-api) says that "A client should first make a request with no auth parameter" and this is not what element-web is doing (since it is sending an auth parameter with an empty dictionary). In the upload cross-signing keys endpoint [documentation](https://spec.matrix.org/v1.14/client-server-api/#post_matrixclientv3keysdevice_signingupload_request_authentication-data) it says that type may be omitted if session is set, but in this specific case neither of the fields is set. * fixup! Do not send empty auth when setting up cross-signing keys