Do not fail if pillar.postgresql is not defined
This patch slightly improves selection of the default version of
postgres using grain.filter_by instead of if/elif/else logic.
Change-Id: Ic6c912685cbc845405158be5e83ae289a13d455b
diff --git a/postgresql/map.jinja b/postgresql/map.jinja
index 4e590fe..1cb9b4d 100644
--- a/postgresql/map.jinja
+++ b/postgresql/map.jinja
@@ -1,13 +1,10 @@
+{%- set default_version = salt['grains.filter_by']({
+ 'xenial': '9.5',
+ 'trusty': '9.3',
+ 'default': '9.5',
+}, grain='oscodename') %}
-{%- if grains.oscodename == "xenial" %}
-{%- set default_version = '9.5' %}
-{%- elif grains.oscodename == "trusty" %}
-{%- set default_version = '9.3' %}
-{%- else %}
-{%- set default_version = '9.5' %}
-{%- endif %}
-
-{%- set version_uni = pillar.postgresql.get('server', {}).get('version', default_version)|string %}
+{%- set version_uni = salt['pillar.get']('postgresql:server:version', default=default_version)|string %}
{%- set version = version_uni.encode() %}
{%- set version_numbers = version|replace('.', '') %}
{%- set server = salt['grains.filter_by']({