does not work in puppet 4

[rustamar]

wp_lang parameter is checked on string value and default value is "".
But puppet 4 uses new parser which resolve
if ${wp_lant} as true with default value.

Following fix resolve the problem:
manifests/instance/app.pp:
67:- if $wp_lang {
67:+ if $wp_lang and $wp_lang != '' {

[rustamar]

Better late than never :-)