@Override public void verify(CommandCall commandCall, Evaluator evaluator, ResultRecorder resultRecorder) { Check.isFalse( commandCall.hasChildCommands(), "Nesting commands inside an 'echo' is not supported"); Object result = evaluator.evaluate(commandCall.getExpression()); Element element = commandCall.getElement(); if (result != null) { element.appendText(result.toString()); } else { Element child = new Element("em"); child.appendText("null"); element.appendChild(child); } }