Bug 168318 [regression]Print doesn't work correctly when preview attached file through external browser[00]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
{
			vv1 = evaluate( v1.getText( ) );
		}
		if ( v2 != null )
		{
			vv2 = evaluate( v2.getText( ) );
		}
		try
		{
			return ScriptEvalUtil.evalConditionalExpr( testExprValue, expr
					.getOperator( ), vv1, vv2 );
		}
		catch ( Exception e )
		{
			log.log( Level.SEVERE, e.getMessage( ), e );
			addException( new EngineException(
					MessageConstants.INVALID_EXPRESSION_ERROR, expr, e ) );
			return Boolean.FALSE;
		}
	}
	/**
	 * execute the script. simply evaluate the script, and drop the return value
	 * 
	 * @param script
	 *            script to be executed
	 */
	public void execute( String script )
	{
		if ( script != null )
		{