Fix S2094 FP: Allow to have empty classes, used as generic parameter

[sm-g]

I have class

using Microsoft.AspNetCore.Authorization;

public class TokenRequirement : IAuthorizationRequirement
{
}

and later use it:

TokenRequirementHandler : AuthorizationHandler<TokenRequirement>

Note: usage could be in other csproj, i.e. for StringLocalizer we have separate csproj for Resources with defined empty classes.