Bug 121687 Exception throws when export data in table which inside a grid cell.
Description: Exception throws when export data in table which inside a grid cell. Steps to reproduce: 1. insert a grid. 2. insert one table to one grid cell. 3. insert another table to the other grid cell. 4. export data in two tables. Expected result: Data are exported. Actual result: Exception in: ReportEngineService.getMetaData( )
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/Report.java
}
	/**
	 * get message of the resource key
	 * 
	 * @param resourceKey
	 *            resource key
	 * @param locale
	 *            locale.
	 * @return message text.
	 */
	public String getMessage( String resourceKey, Locale locale )
	{
		if ( this.reportDesign != null )
		{
			return this.reportDesign.getMessage( resourceKey, locale );
		}
		return null;
	}
	/**
	 * @return Returns the reportDesign.
	 */
	public ReportDesignHandle getReportDesign( )
	{
		return reportDesign;
	}
	/**
	 * @param reportDesign
	 *            The reportDesign to set.
	 */
	public void setReportDesign( ReportDesignHandle reportDesign )