Puppet: Don't fail on createlang for PostgreSQL databases

refs #9453

.puppet/modules/pgsql/manifests/database/create.pp

@@ -25,7 +25,7 @@ define pgsql::database::create ($username, $password) {
     unless  => "psql -tAc \"SELECT 1 FROM pg_roles WHERE rolname='${username}'\" | grep -q 1",
     command => "psql -c \"CREATE ROLE ${username} WITH LOGIN PASSWORD '${password}';\" && \
 createdb -O ${username} -E UTF8 -T template0 ${name} && \
-createlang plpgsql ${name}",
+(createlang plpgsql ${name} || true)",
     user    => 'postgres',
     require => Class['pgsql']
   }