$template_option if not working in puppet 4

[ubellavance]

This code doesn't seem to be working in puppet 4:

  $template_option         = $template ? {
    ''      => '',
    default => "--template=${template}"
  }

Adding a vhost without specifying the template doesn't work. The if must be revised.

[ubellavance]

Please create and assign a label named "puppet4"