mas-cli config wants upstream_oauth2

[chrissteinke]

From the release notes:

The mas-cli config dump and mas-cli config generate commands now strip less common options if they are kept to their default value.

This means that those commands will skip the telemetry, policy, templates, upstream_oauth2, branding and experimental sections if no custom value is set.

Without any upstream_oauth2 parts or empty set of providers, so that the mas-cli dump strips that block, the server fails to start with : 'Error: missing field upstream_oauth2'

Adding the empty list of providers in the ' upstream_oauth2' section let the server start again.