// In the past, when only one openID provider was allowed, there
		// was no `enable` parameter - the configuration is turned off
		// by clearing the values. With multiple providers, we support
		// individually enabling/disabling provider configurations. If
		// the enable parameter's value is non-empty, we use that
		// setting, otherwise we treat it as enabled if some important
		// parameters are non-empty.
		var (