isEmptyPane(pane) {
			return dom.isEmpty(pane, n => n.classList.contains('cbi-tab-descr'));
		}
Checks whether the given tab pane node is empty.

@instance
@memberof LuCI.ui.tabs
@param {Node} pane
The tab pane to check.

@returns {boolean}
Returns `true` if the pane is empty, else `false`.