[Bug fix] Extend key property validation with null check in VMware.PSDesiredStateConfiguration

[dmilov]

Changed

• Extended the validation of the key properties of a DSC Resource in the VMware.PSDesiredStateConfiguration module to throw an exception when a key property is $null.

[vmwclabot]

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[SimeonGerginov]

Moving the Testing Done comment here, as the PR Description is merged to the CHANGELOG.md document:

Testing done:

> $config = New-VmwDscConfiguration VMHost_Network_Config
> Start-VmwDscConfiguration $config
Exception: C:\Temp\DSCTest\Modules\VMware.PSDesiredStateConfiguration\Classes\DscItems.ps1:1458
Line |
1458 |  …             throw "Incorrect DSC Configuration: Key Property '$dscKey …
     |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Incorrect DSC Configuration: Key Property 'VMHostName' of resource [VMHostVssNic]VMHostVssNic is NULL

> $config = New-VmwDscConfiguration VMHost_Network_Config
> . C:\Temp\DSCConfigs\VCESXConfig.ps1
> $config = New-VmwDscConfiguration VMHost_Network_Config
> Start-VmwDscConfiguration $config
>