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.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/device/IDeviceRenderer.java
* A property name that indicates if the output associated with the device
	 * should be compressed ('true') or written out as is uncompressed
	 * ('false'). Device renderers should interpret a missing undefined value as
	 * uncompressed.
	 */
	public static final String COMPRESSED_OUTPUT = "output.compressed"; 
	/**
	 * A property name that indicates the dpi (dots/pixels per inch) resolution to use 
	 * when rendering to the device. This is used to convert 'points' in pixels
	 * (a point is 1/72 inch). If not indicated, it will use the default dpi resolution 
	 * of the corresponding display server (typically 96dpi)
	 */
	public static final String DPI_RESOLUTION = "device.resolution"; 
	/**
	 * Device-specific write-only properties that may be set for each device
	 * renderer
	 * 
	 * @param sProperty
	 *            The property whose value is to be set
	 * @param oValue
	 *            The value associated with the property
	 */
	void setProperty( String sProperty, Object oValue );
	/**
	 * Returns an instance of the low level graphics context being used to
	 * render primitives
	 * 
	 * @return An instance of the low level graphics context being used to
	 *         render primitives
	 */