Added check to userinfo endpoint to make sure sub claim is present
Added check to userinfo endpoint to make sure sub claim is present

MienDev/IdentityServer4,jbijlsma/IdentityServer4,MienDev/IdentityServer4,MienDev/IdentityServer4,siyo-wang/IdentityServer4,IdentityServer/IdentityServer4,siyo-wang/IdentityServer4,chrisowhite/IdentityServer4,jbijlsma/IdentityServer4,IdentityServer/IdentityServer4,jbijlsma/IdentityServer4,MienDev/IdentityServer4,chrisowhite/IdentityServer4,chrisowhite/IdentityServer4,IdentityServer/IdentityServer4,jbijlsma/IdentityServer4,IdentityServer/IdentityServer4,siyo-wang/IdentityServer4