Bug 213981 [Automation] [Regression] Exception is thrown out when preview the attached report design [07]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/internal/document/v4/ExtendedItemExecutor.java
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];
				if ( leftEdge == Segment.LEFT_MOST_EDGE )
				{
					DocumentExtension docExt = (DocumentExtension) content
							.getExtension( IContent.DOCUMENT_EXTENSION );
					if ( docExt != null )
					{
						nextOffset = docExt.getFirstChild( );
					}
				}