Get-AzureRmAutomationDscCompilationJob JobParameters hashtable is always empty

### Cmdlet(s)
`Get-AzureRmAutomationDscCompilationJob`

### PowerShell Version
Instructions: to get PowerShell version, type `$PSVersionTable` and look for the value associated with `PSVersion`
```
Name Value
---- -----
PSVersion 5.1.14409.1012
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.14409.1012
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
```

### Module Version
```
PS C:\> Get-Command Get-AzureRmAutomationDscCompilationJob
CommandType Name Version Source
----------- ---- ------- ------
Cmdlet Get-AzureRmAutomationDscCompilationJob 4.1.1 AzureRM.Automation
```

### OS Version
Instructions: to get OS version, type `$PSversionTable` and look for value associated with `BuildVersion`

### Description
The property `JobParameters` hashtable is always empty. However, if I use resource explorer, I can see the compilation job's "parameters" listing all the ConfigurationData and parameters passed to the compilation job.

### Debug Output
Instructions: to get Debug Output, set `$DebugPreference="Continue"` and then execute the cmdlet or script causing the issue

I don't have time to redact the information. If someone from MS cares to contact me via email, I'll gladly share. (How about adding a feature that automatically redacts information that should remain out of the public domain).

### Script/Steps for Reproduction
```
$Job = Get-AzureRmAutomationDscCompilationJob -ConfigurationName "MyDscConfiguration" -ResourceGroupName $AARG -AutomationAccountName $AA

$LatestJob = $Job | Sort EndTime | Select -last 1

$LatestJob

ResourceGroupName : MyAARG
AutomationAccountName : MyAutomationAccount
Id : 21c3f990-1321-23b3-cbc2-fd9b6f7b31da
CreationTime : 19/01/2018 09:06:50 +00:00
Status : Completed
StatusDetails :
StartTime : 19/01/2018 09:11:15 +00:00
EndTime : 19/01/2018 09:13:55 +00:00
Exception :
LastModifiedTime : 19/01/2018 09:13:55 +00:00
LastStatusModifiedTime : 01/01/0001 00:00:00 +00:00
JobParameters : {}
ConfigurationName : MyDscConfiguration

#Just to confirm that there isn't anything in JobParameters:

$LatestJob.JobParameters.Count
0
```

In resource explorer ([https://resources.azure.com](https://resources.azure.com)), drill down:
Subscriptions >MySubscription > resourceGroups > MyAARG > providers > MyAutomationAccount > compilationjobs > 21c3f990-1321-23b3-cbc2-fd9b6f7b31da

All configuration data and parameters are shown. I'd expect the same information to be present in JobParameters