use False as default, and test boolean, rather than none

php/ng/installed.jinja

@@ -21,8 +21,8 @@
 {% endif %}
 
 {% if grains['os_family']=="Debian" and (state == 'cli' or state == 'fpm' or state == 'php') %}
-{% set use_ppa        = salt['pillar.get']('php:use_ppa', none) %}
-{% if use_ppa is not none %}
+{% set use_ppa        = salt['pillar.get']('php:use_ppa', False) %}
+{% if use_ppa %}
 
 {% set ppa_name        = salt['pillar.get']('php:ppa_name', 'ondrej/php5') %}