Bug 140395 IImage.getID() return null on chart images
When I use image.getID() to retrieve ID of chart image, it always returns null.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/Image.java
}
	} /*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.birt.report.engine.api2.IImage#getID()
		 */
	public String getID( )
	{
		return id;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api2.IImage#getSource()
	 */
	public int getSource( )
	{
		return source;
	}
	public void setSource( int source )
	{
		this.source = source;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api2.IImage#getImageData()
	 */
	public byte[] getImageData( ) throws OutOfMemoryError
	{