Bug 187444 [Automation][Regression] chart using inherited dataset did not work properly
steps to reproduce: - use the attached report design - preview in html, pdf and viewer expected behavior: - attached report should be previewed properly actual behavior: - return empty report
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/internal/document/v4/ExtendedItemExecutor.java
DocumentExtension docExt = (DocumentExtension) content
						.getExtension( IContent.DOCUMENT_EXTENSION );
				if ( docExt != null )
				{
					nextOffset = docExt.getFirstChild( );
				}
			}
			if ( fragment != null )
			{
				if ( sections == null )
				{
					sections = fragment.getSections( );
					nextSection = -1;
					useNextSection = true;
				}
			}
			prepareFirstChild = false;
		}
		if ( fragment != null )
		{
			if ( useNextSection )
			{
				useNextSection = false;
				nextSection++;
				if ( sections == null || nextSection >= sections.length )
				{
					
					return null;
				}
				Object leftEdge = sections[nextSection][0];