Fix all of the nullable issues

MistoxServer/Client/TCPClient.cs

@@ -48,10 +48,11 @@ namespace Mistox.Client {
                         await ns.ReadExactlyAsync(payloadBuffer, 0, Header.DataLength);
 
                         // Create the dataobject
-                        dynamic dataobject = DataPacket.Deserialize( Header, payloadBuffer.AsMemory(DataPacket.HeaderLength, Header.DataLength) );
-
-                        // Return the object
-                        _parent.InvokeOnReceived(dataobject);
+                        object? dataobject = DataPacket.Deserialize( Header, payloadBuffer.AsMemory(DataPacket.HeaderLength, Header.DataLength) );
+                        if (dataobject != null) {
+                            // Return the object
+                            _parent.InvokeOnReceived(dataobject);   
+                        }
 
                     }
                 } catch (Exception e) {