Bug 179636 [Smoke] Chart can not be previewed [0001]
Description: Chart can not be previewed Build number: 2.2.0.v20070328-0630 Steps to reproduce: 1. New a chart, preview. Expected result: Chart is displayed correctly. Actual result: Chart can not be previewed. Error log: N/A
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
Set nullParams = getParameterValues( request, PARAM_ISNULL );
		if ( nullParams != null && nullParams.contains( name ) )
		{
			isExist = true;
		}
		return isExist;
	}
	/**
	 * If set isWorkingFolderAccessOnly as true, check the file if exist in
	 * working folder.
	 * 
	 * @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( ) )
			{