Fix crash in ExViewer.Views.GalleryPage.GalleryPage_obj1_Bindings.Update_VM

[OpportunityLiu]

Version: 2016.9.20.0 | ExViewer

Stacktrace

ExViewer.Views.GalleryPage.GalleryPage_obj1_Bindings;Update_VM;;
ExViewer.Views.GalleryPage.GalleryPage_obj1_Bindings.GalleryPage_obj1_BindingsTracking;DependencyPropertyChanged_VM;;
Windows.UI.Xaml.Media.Imaging.DownloadProgressEventHandler;Invoke;;
System.Runtime.ExceptionServices.ExceptionDispatchInfo;Throw;;
Microsoft.HockeyApp.Extensibility.Windows.UnhandledExceptionTelemetryModule;CoreApplication_UnhandledErrorDetected;;

Reason

Arg_ArgumentException

Link to HockeyApp

• https://rink.hockeyapp.net/manage/apps/339042/crash_reasons/137003826