Allow null args to dynamic invocations

lib/src/codegen/js_codegen.dart

 // 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.
 
 library dev_compiler.src.codegen.js_codegen;
 
 import 'dart:collection' show HashSet, HashMap;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/src/generated/ast.dart' hide ConstantEvaluator;
@@ skipping 585 matching lines @@
               classElem.lookUpInheritedConcreteMethod(name, currentLibrary);
           if (inheritedElement != null &&
               inheritedElement.type == element.type) continue;
           var unary = node.parameters.parameters.isEmpty;
           var memberName = _emitMemberName(name,
               type: cType, unary: unary, isStatic: node.isStatic);
           var parts =
               _emitFunctionTypeParts(element.type, dynamicIsBottom: false);
           var property =
               new JS.Property(memberName, new JS.ArrayInitializer(parts));
-         if (node.isStatic) {
+          if (node.isStatic) {
             tStatics.add(property);
             sNames.add(memberName);
           } else tMethods.add(property);
         }
       }
       build(name, elements) {
         var o =
             new JS.ObjectInitializer(elements, vertical: elements.length > 1);
         var e = js.call('() => #', o);
         var p = new JS.Property(_propertyName(name), e);
@@ skipping 1985 matching lines @@
 
 /// A special kind of element created by the compiler, signifying a temporary
 /// variable. These objects use instance equality, and should be shared
 /// everywhere in the tree where they are treated as the same variable.
 class TemporaryVariableElement extends LocalVariableElementImpl {
   TemporaryVariableElement.forNode(Identifier name) : super.forNode(name);
 
   int get hashCode => identityHashCode(this);
   bool operator ==(Object other) => identical(this, other);
 }