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
if ( leftEdge == Segment.LEFT_MOST_EDGE )
				{
					DocumentExtension docExt = (DocumentExtension) content
							.getExtension( IContent.DOCUMENT_EXTENSION );
					if ( docExt != null )
					{
						nextOffset = docExt.getFirstChild( );
					}
				}
				else
				{
					InstanceIndex leftIndex = (InstanceIndex) leftEdge;
					InstanceID leftId = leftIndex.getInstanceID( );
					nextOffset = leftIndex.getOffset( );
					uniqueId = leftId.getUniqueID( );
				}
			}
		}
		
		
		if ( nextOffset == -1 )
		{
			return null;
		}
		ReportItemExecutor childExecutor = doCreateExecutor( nextOffset );
		if ( childExecutor != null )
		{
			IContent childContent = childExecutor.execute( );
			if ( childContent != null )
			{