fix：_packetService is null error

JusterZhu · JusterZhu · commit cbf1d9ab3aaf · 2023-10-22T20:27:25.000+08:00
https://gitee.com/GeneralLibrary/GeneralUpdate.Tools/issues/I88SZQ
diff --git a/src/WPF/GeneralUpdate.Packet/ViewModels/PacketViewModel.cs b/src/WPF/GeneralUpdate.Packet/ViewModels/PacketViewModel.cs
@@ -35,6 +35,7 @@ internal PacketViewModel()
             CurrentEncoding = Encodings.First();
             CurrentFormat = Formats.First();
             CurrentAppType = AppTypes.First();
+            _packetService = new PacketService();
         }
 
         #endregion Constructors

Original file line number	Diff line number	Diff line change
`@@ -35,6 +35,7 @@ internal PacketViewModel()`
`35`	`35`	`CurrentEncoding = Encodings.First();`
`36`	`36`	`CurrentFormat = Formats.First();`
`37`	`37`	`CurrentAppType = AppTypes.First();`
	`38`	`+ _packetService = new PacketService();`
`38`	`39`	`}`
`39`	`40`
`40`	`41`	`#endregion Constructors`