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
* @return
	 */
	public static String getInitProp( String key )
	{
		if ( initProps == null || key == null )
			return null;
		return (String) initProps.get( key );
	}
	/**
	 * Returns the extension name according to format
	 * 
	 * @param format
	 * @return
	 */
	public static String getExtensionName( String format )
	{
		if ( format == null )
			return null;
		String key = "viewer.extension." + format.replaceAll( " ", "_" ); 
		return DataUtil.trimString( getInitProp( key ) );
	}
	/**
	 * Returns the output format label name
	 * 
	 * @param format
	 * @return
	 */
	public static String getOutputFormatLabel( String format )
	{
		if ( format == null )