ObsoleteCallInspection is throwing an ArgumentNullException

[retailcoder]

Repro:

Sub dosomething()
    Call foo
End Sub

Sub foo()
End Sub

Stack trace (only the relevant part):

System.ArgumentNullException: Value cannot be null.
Parameter name: [context] and [comment] cannot both be null.
   at Rubberduck.Inspections.ObsoleteCallStatementInspection.<GetInspectionResults>b__2(IdentifierReference issue) in c:\Users\Mathieu\Source\Repos\Rubberduck\RetailCoder.VBE\Inspections\ObsoleteCallStatementInspection.cs:line 24

The problem is with the soft cast on this line:

issue.Context.Parent as VBAParser.ExplicitCallStmtContext

Which returns a null reference. The base constructor for a CodeInspectionResultBase does not accept that, by design:

        if (context == null && comment == null)
            throw new ArgumentNullException("[context] and [comment] cannot both be null.");

Fixing the soft cast will fix that bug.