[void]

Так это сделано в css_styled_content:

		# "Section index (pagecontent w/Index checked)"
		3 < styles.content.get
		3.wrap = <div class="csc-menu csc-menu-3">|</div>
		3.select.andWhere = sectionIndex!=0
		3.select.pidInList.override.field = pages
		3.renderObj = TEXT
		3.renderObj {
			fieldRequired = header
			trim=1
			field = header
			htmlSpecialChars = 1
			wrap = <p class="csc-section">|</p>
			typolink.parameter.field = pid
			typolink.section.field = uid
		}

Осталось добавить проверку на количество блоков...