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
{
		return reportDesign.getAfterCloseDoc( );
	}
	public String getAfterFactory( )
	{
		return reportDesign.getAfterFactory( );
	}
	public String getAfterOpenDoc( )
	{
		return reportDesign.getAfterOpenDoc( );
	}
	public String getAfterRender( )
	{
		return reportDesign.getAfterRender( );
	}
	public String getBeforeCloseDoc( )
	{
		return reportDesign.getBeforeCloseDoc( );
	}
	public String getBeforeFactory( )
	{
		return reportDesign.getBeforeFactory( );
	}
	public String getBeforeOpenDoc( )
	{
		return reportDesign.getBeforeOpenDoc( );
	}
	public String getBeforeRender( )
	{
		return reportDesign.getBeforeRender( );