Various improvements to win_package

windows/win_package.ps1

@@ -100,7 +100,15 @@ Function Throw-TerminatingError
         [System.Management.Automation.ErrorRecord] $ErrorRecord
     )
     
+    if ($errorRecord)
+    {
         $exception = new-object "System.InvalidOperationException" $Message,$ErrorRecord.Exception
+    }
+    Else
+    {
+        $exception = new-object "System.InvalidOperationException" $Message
+    }
+    
     $errorRecord = New-Object System.Management.Automation.ErrorRecord $exception,"MachineStateIncorrect","InvalidOperation",$null
     throw $errorRecord
 }
@@ -186,7 +194,19 @@ Function Validate-StandardArguments
         try
         {
             Trace-Message "Parsing $ProductId as an identifyingNumber"
+            $TestGuid = [system.guid]::NewGuid()
+            #Check to see if the productid is a guid
+            if ([guid]::TryParse($ProductId, [ref]$TestGuid))
+            {
                 $identifyingNumber = "{{{0}}}" -f [Guid]::Parse($ProductId).ToString().ToUpper()
+                Trace-Message "Parsed $ProductId as $identifyingNumber (is guid)"
+            }
+            Else
+            {
+                $identifyingNumber = $ProductId
+                Trace-Message "Parsed $ProductId as $identifyingNumber (is not guid)"
+            }
+            
             Trace-Message "Parsed $ProductId as $identifyingNumber"
         }
         catch
@@ -1287,17 +1307,12 @@ Else
     }
     catch
     {
-        $errormsg = $_[0].exception
-    }
-
-    if ($errormsg)
-    {
+        $errormsg = $_
         Fail-Json -obj $result -message $errormsg.ToString()
     }
-    Else
-    {
+
     #Check if DSC thinks the computer needs a reboot:
-        if ($global:DSCMachineStatus -eq 1)
+    if ((get-variable DSCMachinestatus -Scope Global -ea 0) -and ($global:DSCMachineStatus -eq 1))
     {
         Set-Attr $result "restart_required" $true
     }
@@ -1305,6 +1320,6 @@ Else
     #Set-TargetResource did its job. We can assume a change has happened
     Set-Attr $result "changed" $true
     Exit-Json -obj $result
-    }
+    
 }