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
{
			if ( input != null )
			{
				try
				{
				input.close( );
				}
				catch (IOException e)
				{
					logger.log( Level.SEVERE, e.getMessage( ), e );
				}
			}
			if ( output != null )
			{
				try
				{
				output.close( );
				}
				catch (IOException e)
				{
					logger.log( Level.SEVERE, e.getMessage( ), e );
				}
			}
		}
		
	}
	/**
	 * Copies the stream from the source to the target
	 * 
	 * @param src