Removed empty array

src/Microsoft.AspNetCore.SignalR/HubEndPoint.cs

@@ -30,7 +30,6 @@ namespace Microsoft.AspNetCore.SignalR
         private readonly Dictionary<string, Func<Connection, InvocationDescriptor, Task<InvocationResultDescriptor>>> _callbacks
             = new Dictionary<string, Func<Connection, InvocationDescriptor, Task<InvocationResultDescriptor>>>(StringComparer.OrdinalIgnoreCase);
         private readonly Dictionary<string, Type[]> _paramTypes = new Dictionary<string, Type[]>();
-        private static object[] EmptyArray = new object[0];
 
         private readonly HubLifetimeManager<THub> _lifetimeManager;
         private readonly IHubContext<THub, TClient> _hubContext;