add exit status codes to query a single package

if a single package version is queried at the cli in cmd or posh
then a 0 error status code is returned if the package is present on
the system or a 1 status code if 'not found'

src/functions/Chocolatey-Version.ps1

@@ -82,4 +82,10 @@ param(
       $versionsObj
     }
   }
+
+  # exit error 1 if querying a single package, no version returned, and not called from another function (ie cup)
+  $commandType=((Get-Variable -Name MyInvocation -Scope 1 -ValueOnly).MyCommand).CommandType
+  if ($packages.count -eq 1 -and $versionFound -eq 'no version' -and $commandType -ne 'Function') {
+    throw ""
+  }
 }