Exceptions thrown when running demos in Debug mode

[mroavi]

An exception is thrown whenever I click any of the first three links in the browser window (see below). I am running Visual Studio 2017 express on Windows 10.

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=MurderMystery
  StackTrace:
   at MurderMystery.VariablesViewModel.get_DaggerOpacity() in C:\Users\martin\repos\mbmlbook\src\1. A Murder Mystery\Views\VariablesViewModel.cs:line 335
   at Microsoft.Research.Glo.Object.Property_251.GetValue(Object )
   at Microsoft.Research.Glo.Object.PropertyPart..ctor(IExpressionPart parent, ClrProperty cprop, Object defaultObj)

[msdmkats]

Apparently, this was only a problem when the app was being debugged. Without debugger WPF simply swallowed all those exceptions (lot of them) and continued to function. Anyway, 6f23a0b should have fixed this.

[mroavi]

Thanks for fixing this. I'm not familiar with C# and being able to step through the code helps a lot. Could you also fix a similar issue in the "Assessing People Skills"demo?

System.NullReferenceException: 'Object reference not set to an instance of an object.'

AssessingPeoplesSkills.Metrics.Inputs.get returned null.

[novikov-alexander-zz]

Hi @mroavi ,
Thanks for feedback.
I've fixed all exceptions produced by the code of 2nd and 3rd chapters which I faced.
It is done in 1237386 and dd94718.