Bug 152430 Key can modify to empty string
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/EmbeddedImageHandle.java
* Constructs the handle of embedded image.
	 * 
	 * @param valueHandle
	 *            the value handle for embedded image list of one property
	 * @param index
	 *            the position of this embedded image in the list
	 */
	public EmbeddedImageHandle( SimpleValueHandle valueHandle, int index )
	{
		super( valueHandle, index );
	}
	/**
	 * Returns the byte array of image data.
	 * 
	 * @return the byte array of image data
	 */
	public byte[] getData( )
	{
		EmbeddedImage image = (EmbeddedImage) getStructure( );
		return image.getData( getModule() );
	}
	/**
	 * Sets the byte array of image data.
	 * 
	 * @param data
	 *            the byte array to set
	 */
	public void setData( byte[] data )
	{
		try