fixes #175, fixed arrays

lib/runtime/dart_runtime.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 var dart, _js_helper, _js_primitives;
 (function (dart) {
   'use strict';
 
   let defineProperty = Object.defineProperty;
   let getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
@@ skipping 949 matching lines @@
   // TODO(jmesserly): right now this is a sentinel. It should be a type object
   // of some sort, assuming we keep around `dynamic` at runtime.
   dart.dynamic = { toString() { return 'dynamic'; } };
   dart.void = { toString() { return 'void'; } };
   dart.bottom = { toString() { return 'bottom'; } };
 
   dart.global = window || global;
   dart.JsSymbol = Symbol;
 
   function import_(value) {
-    if (!value) throw 'missing required module';
+    // TODO(jmesserly): throw once we're loading all of core libs.
+    if (!value && console) console.warn('missing required module');
     return value;
   }
   dart.import = import_;
   
   function lazyImport(value) {
     return defineLibrary(value, {});
   }
   dart.lazyImport = lazyImport;
 
   function defineLibrary(value, defaultValue) {
     return value ? value : defaultValue;
   }
   dart.defineLibrary = defineLibrary;
 
   // TODO(jmesserly): hack to bootstrap the SDK
   _js_helper = _js_helper || {};
   _js_helper.checkNum = notNull;
 
   _js_primitives = _js_primitives || {};
   _js_primitives.printString = (s) => console.log(s);
 
 })(dart || (dart = {}));