Random institution name used if IdP is not found in metadata list

[baszoetekouw]

When loggin in with an unknown IdP (for example, SURFnet acc on test), SBS shows a random idP name:

Maybe just show "unknown institution" in this case.

[oharsta]

SRAM does not show a random IdP, but shows the DisplayName from the https://metadata.surfconext.nl/edugain-downstream.xml metadata where the Scope value equals the user.schac_home_organisation. However when the user is provisioned in the /proxy_authz we don't receive the schac_home_organisation and it is set to None.

Due to a bug / feature in the idp_metadata_parser the not nl language is used as the en language. In the metadata stream there is a Croatian DisplayName (<mdui:DisplayName xml:lang="hr">AAI@EduHr sustav jedinstvene autentikacije korisnika</mdui:DisplayName>) which is picked up as the en language and is tied to 237 Scope / schac_home_organisation values. Due to another feature / bug one of the values is None and this equals the schac_home_organisation of the user. Solution is to add a schac_home_organisation value to the dict which eduTeams sends to the /proxy_authz endpoint (and do not store None scope values in the metadata). Related to #577.

[baszoetekouw]

This is done.