Export-ModuleMember cmdlet throws an exception if module functions are exported across language boundaries (Windows only). But a scriptblock LanguageMode property can be null if the scriptblock is created without a PowerShell context, and this can happen through the PowerShell API called from C#. In this case Export-ModuleMember throws erroneously when no language mode restrictions are in play.
Fix is to check if LanguageMode is null before comparing context and scriptblock language modes.
Consolidation of all Windows PowerShell work ported to PSCore6
* Added ps1 file import restriction. Refactored InvokeLanguageModeTestingSupportCmdlet to HelpersSecurity module
* JEA loop back fix. Debugger running commands in CL mode.
* Support for new AMSI codes. Changed to use AMSI buffer API. Unhandled exception fix.
* Fixes for module bugs while running in ConstrainedLanguage mode
* Untrusted input tracking work
* Configuration keyword bug fix, PSRP protocol version check for reconstruct reconnect, Sharing InitialSessionState in runspace pool.
* Restricted remote session in UMCI, Applocker detection collision, Help command exposing functions, Null reference exception fix.
* Added mitigation for debugger function exposure
