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
makeDir( documentFolder );
		
		file = new File( imageFolder );
		deleteDir( file );
		makeDir( imageFolder );
	}
	/**
	 * Deletes all files and subdirectories under dir. Returns true if all
	 * deletions were successful. If a deletion fails, the method stops
	 * attempting to delete and returns false.
	 */
	protected static boolean deleteDir( File dir )
	{
		if ( dir.isDirectory( ) )
		{
			String[] children = dir.list( );
			for ( int i = 0; i < children.length; i++ )
			{
				boolean success = deleteDir( new File( dir, children[i] ) );
				if ( !success )
				{
					return false;
				}
			}
		}
		
		return dir.delete( );
	}
	/**
	 * Get report parameter by given name.