Not Implement ExternalLoginOnly

[geffzhang]

ExternalLoginOnly Not Implement , throw NotImplementedException:

abp/modules/account/src/Volo.Abp.Account.Web.IdentityServer/Pages/Account/IdentityServerSupportedLoginModel.cs

Line 97 in 654eeed

if (IsExternalLoginOnly)

       if (IsExternalLoginOnly)
        {
            //return await ExternalLogin(vm.ExternalLoginScheme, returnUrl);
            throw new NotImplementedException();
        }