add check for primary_postgresql_host and run add_database if it exists

Author: B00885424

plans/migrate.pp

@@ -123,10 +123,9 @@
     out::message('No nodes to purge from old configuration')
   }
 
-  if $primary_postgresql_host {
+  if $primary_postgresql_host {    
     run_plan('peadm::add_database', targets => $primary_postgresql_host,
       primary_host => $new_primary_host,
-      is_migration => true,
     )
   }