$Null, $VariableThatDoesntExist result in pipeline execution whereas @() doesn't #7049
Description
Steps to reproduce
@() | % {1}
$ArrayList = New-Object System.Collections.ArrayList
$ArrayList | % {1}
$null | % {1}
$VarNotDefined | % {1}
Expected behavior
PS > @() | % {1}
PS > $ArrayList = New-Object System.Collections.ArrayList
PS > $ArrayList | % {1}
PS > $null | % {1}
PS > $VarNotDefined | % {1}
PS >
Actual behavior
PS > @() | % {1}
PS > $ArrayList = New-Object System.Collections.ArrayList
PS > $ArrayList | % {1}
PS > $null | % {1}
1
PS > $VarNotDefined | % {1}
1
Environment data
Name Value
---- -----
PSVersion 6.0.2
PSEdition Core
GitCommitId v6.0.2
OS Microsoft Windows 10.0.17134
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
To follow the principle of least astonishment I would expect all of these to do nothing.