SPUserProfileServiceApp: Fix issue where Get-TargetResource throws an error when no MySiteHost is specified

[hebbea]

Pull Request (PR) description

This PR Fixed issue where error 'You cannot call a method on a null-valued expression' was thrown when no MySiteHost was specified in the User Profile Service Application.

This Pull Request (PR) fixes the following issues

• Fixes #1306

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is