解决8103自定义协议未能注册的情况下，导致协议解析报错

src/JT808.Protocol.Test/MessageBody/JT808_0x0104Test.cs

@@ -143,5 +143,21 @@ namespace JT808.Protocol.Test.MessageBody
                 }
             }
         }
+        [Fact]
+        public void Test2_2()
+        {
+            byte[] bytes = "7E010400C604052458039503D800020100000077BE09010101002D1400000064000500141400000320001F020101002D0F00000064000500191900000840001F030101002D0F00000064000500191900000840001F040101002D0F00000064000500191900000840001F050101002D0F00000064010500191900000840001F060101002D0F00000064000500191900000840001F070101002D0F000000640103001919000004CE001F080101002D0F00000064000500191900000840001F090101000F0F000000C8010500191900000400001F127E".ToHexBytes();
+            JT808Package jT808_0X8104 = JT808Serializer.Deserialize<JT808Package>(bytes);
+            Assert.Equal(Enums.JT808MsgId.查询终端参数应答.ToUInt16Value(), jT808_0X8104.Header.MsgId);
+            Assert.Equal(0x03d8, jT808_0X8104.Header.MsgNum);
+            Assert.Equal("40524580395", jT808_0X8104.Header.TerminalPhoneNo);
+
+            JT808_0x0104 JT808Bodies = (JT808_0x0104)jT808_0X8104.Bodies;
+            Assert.Equal(0x0002, JT808Bodies.MsgNum);
+            Assert.Equal(1, JT808Bodies.AnswerParamsCount);
+            Assert.Null(JT808Bodies.ParamList);
+
+
+        }
     }
 }

src/JT808.Protocol/MessageBody/JT808_0x0104.cs

@@ -57,9 +57,15 @@ namespace JT808.Protocol.MessageBody
                     }
                     else
                     {
-                        jT808_0x0104.ParamList = new List<JT808_0x8103_BodyBase> { JT808MessagePackFormatterResolverExtensions.JT808DynamicDeserialize(instance,  ref reader,  config) };
+                        jT808_0x0104.ParamList = new List<JT808_0x8103_BodyBase> { JT808MessagePackFormatterResolverExtensions.JT808DynamicDeserialize(instance, ref reader, config) };
                     }
                 }
+                else {
+                    //对于未能解析的自定义项，过滤其长度，以保证后续解析正常
+                    reader.Skip(4);//跳过参数id长度
+                    var len = reader.ReadByte();//获取协议长度
+                    reader.Skip(len);//跳过协议内容
+                }
             }
             return jT808_0x0104;
         }