Bug 140620 Chart scripting errors are ignored
Write a chart with an invalid script, the execution simply ignores the script. This makes it difficult to debug scripting. The error message is also not precise and needs improvements.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
* @return the report engine used to create the context.
	 */
	public IReportEngine getEngine( )
	{
		return engine;
	}
	/**
	 * returns taskID as string. The value can be used for logging.
	 * 
	 * @return taskID as string
	 */
	public String getTaskIDString( )
	{
		return taskIDString;
	}
	/**
	 * Clean up the execution context before finishing using it
	 */
	public void close( )
	{
		scriptContext.exit( );
		if ( dataSource != null )
		{
			try
			{
				dataSource.close( );
			}
			catch ( IOException e )
			{
				log.log( Level.SEVERE, "Failed to close the data source", e );