Allow null context in Script

src/node_script.cc

@@ -175,7 +175,7 @@ template <node::Script::EvalInputFlags iFlag,
 
   Local<Object> sandbox;
   if (cFlag == newContext) {
-    sandbox = args.Length() > sbIndex ? args[sbIndex]->ToObject() : Object::New();
+    sandbox = args[sbIndex]->IsObject() ? args[sbIndex]->ToObject() : Object::New();
   } else if (cFlag == userContext) {
     sandbox = args[sbIndex]->ToObject();
   }

test/simple/test-script-context.js

@@ -19,3 +19,7 @@ script = new Script('foo = 3;');
 result = script.runInContext(context);
 assert.equal(3, context.foo);
 assert.equal('lala', context.thing);
+
+
+// Issue GH-227:
+Script.runInNewContext('', null, 'some.js');