title: Check if an item exists without an error if it doesn't exist
body: <p>I'd like to use PowerShell to check whether an IIS Web Application exists (or potentially some other kind of item). I can do this with <code>Get-Item</code>, but that reports an error if the item doesn't exist, which is misleading to the user running the script - it looks like something went wrong when actually everything is fine. </p>
  
  <p>How do I do this without an error?</p>