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
	 */
	private static String getRealPath( String path, ServletContext context )
	{
		assert path != null;
		String realPath = null;
		try
		{
			if ( !path.startsWith( "/" ) ) 
				path = "/" + path; 
			realPath = context.getRealPath( path );
			if ( realPath == null )
			{
				URL url = context.getResource( "/" ); 
				if ( url != null )
					realPath = DataUtil.trimString( url.getFile( ) ) + path;
			}
		}
		catch ( Exception e )
		{
			realPath = path;
		}
		return realPath;
	}
	/**
	 * Make directory
	 * 
	 * @param path
	 * @return
	 */