Fix Get-IntuneWin32AppSupersedence.ps1 logic for single-item responses

[Marco-Valle]

Description

This PR resolves an issue where Get-IntuneWin32AppSupersedence fails to return data in Windows PowerShell 5.1 when exactly one relationship exists.

In Windows PowerShell, [PSCustomObject] scalars do not have an intrinsic .Count property. By switching to a $null check and using the @() array subexpression, we ensure consistent behavior across PS 5.1 and PS 7+.

Related Issue

Fixes #223

Changes

• Updated Get-IntuneWin32AppSupersedence.ps1 to handle scalar Graph responses.
• Normalized relationship results into arrays to ensure .Count is always valid for logic and verbose logging.

Testing

Environment

Verified on:

• Windows PowerShell 5.1 (Windows 11)
• PowerShell 7.6

Output

The following code snippet shows the output of the execution in PowerShell 5.1, where the issue occurs.

PS C:\> Get-IntuneWin32AppSupersedence -ID "bcce6ee9-d839-46c3-b489-e6014345b7ef"
VERBOSE: Querying for Win32 app using ID: bcce6ee9-d839-46c3-b489-e6014345b7ef
VERBOSE: GET https://graph.microsoft.com/Beta/deviceAppManagement/mobileApps/bcce6ee9-d839-46c3-b489-e6014345b7ef
VERBOSE: GET https://graph.microsoft.com/Beta/deviceAppManagement/mobileApps/bcce6ee9-d839-46c3-b489-e6014345b7ef/relationships
PS C:\> # [No data returned, script stopped at the .Count check]

PS C:\patch\Public> . ..\Private\Invoke-MSGraphOperation.ps1
PS C:\patch\Public> . ..\Private\Test-AuthenticationState.ps1
PS C:\patch\Public> . .\Get-IntuneWin32AppSupersedence.ps1
PS C:\patch\Public> Get-IntuneWin32AppSupersedence -ID "bcce6ee9-d839-46c3-b489-e6014345b7ef"
VERBOSE: Querying for Win32 app using ID: bcce6ee9-d839-46c3-b489-e6014345b7ef
VERBOSE: GET https://graph.microsoft.com/Beta/deviceAppManagement/mobileApps/bcce6ee9-d839-46c3-b489-e6014345b7ef
VERBOSE: GET https://graph.microsoft.com/Beta/deviceAppManagement/mobileApps/bcce6ee9-d839-46c3-b489-e6014345b7ef/relationships
VERBOSE: Found 1 supersedence relationship(s)

# [Object Data Returned Successfully]