Bug 200812 Issue when remove one separator setting in viewer.property[0002]
Description: Issue when remove one separator setting in viewer.property Build number:2.2.1.v200708220927 Steps to reproduce: 1. Deploy birt. 2. Open viewer.properties under WEB-INF folder. 3. Delete "viewer.sep.0=," line 4. Start server. 5. Preview report. 6. Export Data, select columns and select "Comma(,)", click OK. Expected result: Comma(,) isn't in the separator list. Actual result: Nothing happened after step6 and no error logs. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
* @param config
	 *            Servlet configuration
	 */
	public synchronized static void initParameters( ServletConfig config )
	{
		if ( !isInitContext )
		{
			ParameterAccessor.initParameters( config.getServletContext( ) );
		}
	}
	/**
	 * Initial the parameters class. Web.xml is in UTF-8 format. No need to do
	 * encoding convertion.
	 * 
	 * @param context
	 *            Servlet Context
	 */
	public synchronized static void initParameters( ServletContext context )
	{
		if ( isInitContext )
			return;
		
		workingFolder = processWorkingFolder( context, context
				.getInitParameter( INIT_PARAM_WORKING_DIR ) );
		
		documentFolder = processRealPath( context, context
				.getInitParameter( INIT_PARAM_DOCUMENT_FOLDER ),
				IBirtConstants.DEFAULT_DOCUMENT_FOLDER, true );
		
		imageFolder = processRealPath( context, context