Get-RscType -InitialProperties fails to init more than one nested property

[rynardtspies]

Issue Description

When using Get-RscType to initialize properties of an object, if multiple nested properties are requested for a nested type, only the first property of the nested property tree is initialized. Subsequent properties return a null reference exception.

Steps to Reproduce

1. Initialize properties with a single nested property:

   $fields = Get-RscType -Name VsphereVm -InitialProperties @("id", "name", "vsphereVirtualDisks.nodes.Fid")
   $fields.VsphereVirtualDisks.Nodes[0]

   Output:

   CdmId                :
   CdmVersion           :
   ClusterUuid          :
   DatastoreFid         :
   DeviceKey            :
   ExcludeFromSnapshots :
   Fid                  : FETCH
   FileName             :
   Size                 :
   VirtualMachineId     :
   Datastore            :
   

2. Initialize properties with another single nested property:

   $fields = Get-RscType -Name VsphereVm -InitialProperties @("id", "name", "vsphereVirtualDisks.nodes.FileName")
   $fields.VsphereVirtualDisks.Nodes[0]

   Output:

   CdmId                :
   CdmVersion           :
   ClusterUuid          :
   DatastoreFid         :
   DeviceKey            :
   ExcludeFromSnapshots :
   Fid                  :
   FileName             : FETCH
   Size                 :
   VirtualMachineId     :
   Datastore            :
   

3. Initialize properties with multiple nested properties:

   $fields = Get-RscType -Name VsphereVm -InitialProperties @("id", "name", "vsphereVirtualDisks.nodes.FileName", "vsphereVirtualDisks.nodes.Fid")

   Output:

   Get-RscType: Object reference not set to an instance of an object.
   $fields.VsphereVirtualDisks.Nodes[0]
   

   CdmId                :
   CdmVersion           :
   ClusterUuid          :
   DatastoreFid         :
   DeviceKey            :
   ExcludeFromSnapshots :
   Fid                  :
   FileName             : FETCH
   Size                 :
   VirtualMachineId     :
   Datastore            :
   

Expected Behavior

Both vsphereVirtualDisks.nodes.FileName and vsphereVirtualDisks.nodes.Fid should be initialized without causing a null reference exception.

Actual Behavior

Only the first property (FileName or Fid) is initialized, and attempting to initialize multiple nested properties results in a null reference exception.

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