code: function(node) {
  			if (node.children.length || node._text || this.isSnippet(node)) {
  				return false;
  			}
  			
  			var r = node.matchedResource();
  			return r && r.is_empty;
  		}
docs: Test if passed node is unary (no closing tag)
  @param {AbbreviationNode} node
  @return {Boolean}