Bug 182687 Exception thrown out when preview crosstab with toc setting
When preview crosstab which has set the toc property, exception will be thrown. Engine need to handle the case during toc processing while no IR object is associated with current content object. java.lang.NullPointerException at org.eclipse.birt.report.engine.executor.ReportItemExecutor.startTOCEntry(ReportItemExecutor.java:591) at org.eclipse.birt.report.engine.executor.ExtendedItemExecutor.execute(ExtendedItemExecutor.java:140) at org.eclipse.birt.report.engine.internal.executor.l18n.LocalizedReportItemExecutor.execute(LocalizedReportItemExecutor.java:36) at org.eclipse.birt.report.engine.layout.html.HTMLPageLM.layoutChildren(HTMLPageLM.java:124) at org.eclipse.birt.report.engine.layout.html.HTMLPageLM.layout
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ReportItemExecutor.java
if ( tocBuilder != null )
		{
			if ( content != null )
			{
				TOCEntry parentTOCEntry = getParentTOCEntry( );
				String hiddenFormats = content.getStyle( ).getVisibleFormat( );
				Object tocValue = content.getTOC( );
				if ( tocValue != null )
				{
					long elementId = ((ReportElementDesign)content.getGenerateBy( )).getID( );
					String bookmark = content.getBookmark( );
					tocEntry = tocBuilder.startEntry( parentTOCEntry, tocValue,
							bookmark, hiddenFormats, elementId );
					String tocId = tocEntry.getNode( ).getNodeID( );
					if ( bookmark == null )
					{
						content.setBookmark( tocId );
					}
					return;
				}
				else if ( hiddenFormats != null )
				{
					tocEntry = tocBuilder.startDummyEntry( parentTOCEntry,
							hiddenFormats );
				}
			}
		}
	}
	/**
	 * finishes a TOC entry, mostly used for non-leaf TOC entry, which can not