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ConsoleHost.PushRunspace throws NullReferenceException when passed a local runspace #5735

Description

@SeeminglyScience

Steps to reproduce

$rs = [runspacefactory]::CreateRunspace()
$rs.Open()
$Host.PushRunspace($rs)

Expected behavior

Either throw a NotSupportedException that states only remote runspaces are supported, or (preferably) enter the local runspace successfully.

Actual behavior

> $rs = [runspacefactory]::CreateRunspace()
> $rs.Open()
> $Host.PushRunspace($rs)
Exception calling "PushRunspace" with "1" argument(s): "Object reference not set to an instance of an object."
At line:1 char:1
+ $Host.PushRunspace($rs)
+ ~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : NullReferenceException

> $Error[0].Exception.InnerException | Format-List * -Force
Message        : Object reference not set to an instance of an object.
Data           : {}
InnerException :
TargetSite     : Void PushRunspace(System.Management.Automation.Runspaces.Runspace)
StackTrace     :    at Microsoft.PowerShell.ConsoleHost.PushRunspace(Runspace newRunspace)
                    at CallSite.Target(Closure , CallSite , Object , Object )
HelpLink       :
Source         : Microsoft.PowerShell.ConsoleHost
HResult        : -2147467261

Environment data

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      6.0.0-rc.2
PSEdition                      Core
GitCommitId                    v6.0.0-rc.2
OS                             Microsoft Windows 10.0.15063
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

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    In-PRIndicates that a PR is out for the issueIssue-BugIssue has been identified as a bug in the productResolution-No ActivityIssue has had no activity for 6 months or moreWG-Enginecore PowerShell engine, interpreter, and runtime

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