Enable user for Lync if not already

Experts,

This should be relatively simple, but I'm drawing a blank from my searches.  If possible, can someone point me in the right direction on how to handle PS negative returns?

This is in regards to Lync, where I need to execute the following:

Enable-CSUser –identity “sAMAccountName” –RegistrarPool “SpecifiedPool” –sipAddressType EmailAddress

But, I need to add it in the "fail" portion of "Get-CSUser".  Basically, if a user isn't enabled, to go ahead and do it.

Thanks for any assistance that can be provided.  Apologies for the basic question, I've searched quite a bit for this, but keep coming back empty.