Edited Unassigned: cross-engine nested exception fault [108]

got one more cross-engine issue.

an error raised by scriptengine (b) which was invoked by another scriptengine (a), doesn't make it to scriptengine (a) and properly back to the origin calle in the stack scriptengine (b). which means the script execution error occurred as such in scriptengine (b) cant be catched by a try-catch on the host side.

on more weird issue happening along side is that the code block (function|sub) where the error was raised gets executed from the very beginning.

in short the call chain looks like this:
```
engineA.someMethod(
engineB.anotherMethod(
engineA.errorOccuringMethod(
- firstLineCode -
someErrorCode -> causing a rerun of engineA.errorOccuringmethod() then throwing COMException in WindowsScriptEngine.ThrowHostException()
)
)
)
```

here a sample code:

```
var seA = new VBScriptEngine();
seA.Script.WriteLine = new Action<string>((text) => Console.WriteLine(text));
seA.Execute(@"
class aclass

function binvoke(bobj)
bobj.bmethod()
end function

end class
dim avar : set avar = new aclass
");

var seB = new VBScriptEngine();
seB.Script.WriteLine = new Action<string>((text) => Console.WriteLine(text));
seB.Execute(@"
class bclass

function bmethod()
WriteLine(""begin-bmethod"")
err.raise 1, ""source"", ""errdescr""
bmethod = ""retval""
WriteLine(""end-bmethod"")
end function

function go(seA, bobj)
dim i
'for i = 0 to 5
seA.binvoke(bobj)
'next
end function

end class
dim bvar : set bvar = new bclass
");


try
{
seB.Script.bvar.go(seA.Script.avar, seB.Script.bvar);
}
catch (System.Runtime.InteropServices.COMException)
{
throw;
}
catch (Exception)
{
throw;
}
```