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 filePath
	 * @return boolean
	 */
	public static boolean isValidFilePath( String filePath )
	{
		if ( filePath == null )
			return false;
		if ( isWorkingFolderAccessOnly )
		{
			File docFile = new File( filePath );
			if ( !docFile.isAbsolute( ) )
			{
				if ( filePath.indexOf( ".." ) != -1 ) 
					return false;
				return true;
			}
			File docFolder = new File( workingFolder );
			if ( docFolder.isAbsolute( ) )
			{
				String absolutePath = docFile.getAbsolutePath( );
				String docFolderPath = docFolder.getAbsolutePath( );
				
				if ( isWindowsPlatform( ) )
				{
					absolutePath = absolutePath.toLowerCase( );
					docFolderPath = docFolderPath.toLowerCase( );
				}
				return absolutePath.startsWith( docFolderPath );
			}