Get-CUENum -> Add support for PipeLine input

[Stephanevg]

In title

>  gci C:\modules\PSHTML\Code\Classes | Get-CUEnum
throw : The term 'throw' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and
try again.
At \\\Modules\psclassutils\2.6.1\PSClassUtils.psm1:1404 char:18
+         $Path = (throw "Please provide a path")
+                  ~~~~~
    + CategoryInfo          : ObjectNotFound: (throw:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException