Bug 179676 [regression]Error when report has chart in master page[05]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/presentation/LocalizedContentVisitor.java
{
		assert ( content != null );
		if ( content.getGenerateBy( ) != null )
		{
			DesignElementHandle element = ( (ReportItemDesign) content
					.getGenerateBy( ) ).getHandle( );
			if ( key != null && element != null )
			{
				String t = ModuleUtil.getExternalizedValue( element, key, text,
						ULocale.forLocale( locale ) );
				if ( t != null )
				{
					return t;
				}
			}
		}
		return text;
	}
	public Object visitImage( IImageContent image, Object value )
	{
		handleOnRender( image );
		processImage( image );
		return image;
	}
	protected void processImage( IImageContent image )
	{
		String altText = localize( image, image.getAltTextKey( ), image.getAltText( ) );
		image.setAltText( altText );
		String helpText = localize( image, image.getHelpKey( ), image.getHelpText( ) );
		image.setHelpText( helpText );