Nullify IIdentityCache

src/Tgstation.Server.Host/Security/IIdentityCache.cs

@@ -2,8 +2,6 @@
 
 using Tgstation.Server.Host.Models;
 
-#nullable disable
-
 namespace Tgstation.Server.Host.Security
 {
 	/// <summary>
@@ -23,7 +21,7 @@ namespace Tgstation.Server.Host.Security
 		/// Attempt to load a cached <see cref="ISystemIdentity"/>.
 		/// </summary>
 		/// <param name="user">The <see cref="User"/> the <see cref="ISystemIdentity"/> belongs to.</param>
-		/// <returns>The cached <see cref="ISystemIdentity"/> or <see langword="null"/> if it doesn't exist or expired.</returns>
+		/// <returns>The cached <see cref="ISystemIdentity"/>.</returns>
 		ISystemIdentity LoadCachedIdentity(User user);
 	}
 }