test for temporary canary object always evaluates to true when running in mode 2

[2a-h]

when running the script in mode 2, the statement on line 785 will always evaluate to $true because both $objectOnTargetDCPwdLastSet and $objectOnSourceOrgRWDCPwdLastSet are uninitialized in this mode and are therefore both equal to $null
https://github.com/microsoft/New-KrbtgtKeys.ps1/blob/aaa1b322f3dd4478f733a01b37dd221c8ff1f8c0/New-KrbtgtKeys.ps1#L785

the statement should evaluate to $false when $targetObjectToCheck is $null because it would mean that, for example, Get-ADObject on lines 755 or 758 failed for some reason
https://github.com/microsoft/New-KrbtgtKeys.ps1/blob/aaa1b322f3dd4478f733a01b37dd221c8ff1f8c0/New-KrbtgtKeys.ps1#L755