Fix for issue #7787 to allow not specifying PowerShellHome when running Install-PowerShellRemoting.ps1

[Orca88]

When PowerShellHome is not specified as a runtime parameter to Install-PowerShellRemoting.ps1, the check '-ne $null' is actually an empty string. Properly checking with [String]::IsNullOrEmpty() solves the problem.

PR Summary

Fix #7787

When PowerShellHome is not specified as a runtime parameter to Install-PowerShellRemoting.ps1, the check '-ne $null' is actually an empty string. Properly checking with [String]::IsNullOrEmpty() solves the problem.

PR Context

Restore expected behavior to match documentation of PowerShell Core installation.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
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• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed: 7787
• Testing - New and feature
  • N/A or can only be tested interactively
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  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • I have considered the user experience from a tooling perspective and enumerated concerns in the summary. This may include:
    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode (which runs in a different PS Host).
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).

[iSazonov]

@Orca88 Thanks for your contribution!

[ghost]

🎉v7.0.0-preview.5 has been released which incorporates this pull request.:tada:

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