c90a76b providers/openidc: Do not stringify empty array for 'amr' when setting up auth response

Authored and Committed by ngompa 5 months ago
    providers/openidc: Do not stringify empty array for 'amr' when setting up auth response
    
    We transform the whole authentication response dictionary into JSON later on, so
    we do not need to do it while building the dictionary.
    
    Signed-off-by: Neal Gompa <ngompa13@gmail.com>