proxy: Fix provsioning new users with the default role

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With 078698fdf4 the semantics of the
ListRoleAssignments Call in the settings service change. It no
no longer returns a "not found" error when there is not RoleAssignment
for a user. We'll just get an empty list as the result.

This changes the behaviour of the default role assignment to work with
the new semantics.

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500 Internal Server Error

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