Small changes to allow a xerte standalone project to be imported in XOT 2.18  - Make sure that if preview.xml is not found, no empty preview.xml is produced  - Facilitate debugging when development is set to true in config.php
Small changes to allow a xerte standalone project to be imported in XOT 2.18
 - Make sure that if preview.xml is not found, no empty preview.xml is produced
 - Facilitate debugging when development is set to true in config.php

git-svn-id: 17e300447cb4b020d428f438ce6532ae41087135@424 912cdd6b-5c7d-d5a7-a2ba-d0f0cdb91641

torinfo/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,torinfo/xerteonlinetoolkits