A few more lingering bugs:

* add helperMissing.not to the specs
* add Handlebars.Utils.isEmpty
* add runtime handling for inverse sections
* fix __get__ to pass an IdNode to evaluate
* handle case in wrapProgram where context is undefined

spec/qunit_spec.js

@@ -15,6 +15,10 @@ var helperMissing = function(context, fn) {
   } else {
 		return fn(context);
 	}
+};
+
+helperMissing.not = function(context, fn) {
+  return fn(context);
 }
 
 var shouldCompileTo = function(string, hash, expected, message) {