Out-of-process WinRT doesn't support passing null to an array parameter

[hez2010]

Describe the bug
Out-of-process WinRT doesn't support passing null to an array parameter.

While trying to do this, an exception will be thrown.

System.Runtime.InteropServices.COMException (0x800706F4)
   at WinRT.ExceptionHelpers.<ThrowExceptionForHR>g__Throw|39_0(Int32 hr)
   at WinRT.ExceptionHelpers.ThrowExceptionForHR(Int32 hr)
   at ABI.WinRTServer.ITestClassClassMethods.Test(IObjectReference _obj, Int32[] array)
   at WinRTServer.TestClass.Test(Int32[] array)
   at Program.<Main>$(String[] args)

Note that in-process server does work in this scenario.

To Reproduce

1. Clone https://github.com/hez2010/WinRTServer
2. Checkout the branch array-repro: https://github.com/hez2010/WinRTServer/tree/array-repro
3. Build and run

Expected behavior
No exception.

Version Info
CsWinRT 2.0.7

Additional context