添加 ETV语音电视的支持。另外修改一些BUG

RCUHost/Implement/HostServer.cs

@@ -188,7 +188,7 @@ namespace RCUHost.Implement
             {
                 logger.Error("Host Server启动失败，端口：3339");
                 Close();
-                throw ex;//不能去掉，否则重启iis服务，通讯服务不会再次启动
+                //throw ex;//不能去掉，否则重启iis服务，通讯服务不会再次启动
             }
         }
         /// <summary>
@@ -1517,10 +1517,13 @@ namespace RCUHost.Implement
                         byte cmdTypeTTT = context.SystemHeader.Value.CmdType;
                         if (cmdTypeTTT == 0x36)
                         {
-                            IReceiver receiver = receivers[(CommandType)0x36];
-                            if (receiver != null)
+                            if (receivers.ContainsKey((CommandType)0x36))
                             {
-                                (receiver as GenericReceiverBase).Process(context);//处理业务逻辑
+                                IReceiver receiver = receivers[((CommandType)0x36)];
+                                if (receiver != null)
+                                {
+                                    (receiver as GenericReceiverBase).Process(context);//处理业务逻辑
+                                }
                             }
                         }
                         else