Fix an exception caused by malformed code

pkg/analyzer/lib/src/generated/resolver.dart

 // Copyright (c) 2014, 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 analyzer.src.generated.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 7659 matching lines @@
     _addPropagableVariables(node.variables.variables);
     _addStaticVariables(node.variables.variables);
     return super.visitTopLevelVariableDeclaration(node);
   }
 
   /**
    * Add all of the [variables] with initializers to [propagableVariables].
    */
   void _addPropagableVariables(List<VariableDeclaration> variables) {
     for (VariableDeclaration variable in variables) {
-      if (variable.initializer != null) {
+      if (variable.name.name.isNotEmpty && variable.initializer != null) {
         VariableElement element = variable.element;
         if (element.isConst || element.isFinal) {
           propagableVariables.add(element);
         }
       }
     }
   }
 
   /**
    * Add all of the [variables] with initializers to the list of variables whose
    * type can be inferred. Technically, we only infer the types of variables
    * that do not have a static type, but all variables with initializers
    * potentially need to be re-resolved after inference because they might
    * refer to a field whose type was inferred.
    */
   void _addStaticVariables(List<VariableDeclaration> variables) {
     for (VariableDeclaration variable in variables) {
-      if (variable.initializer != null) {
+      if (variable.name.name.isNotEmpty && variable.initializer != null) {
         staticVariables.add(variable.element);
       }
     }
   }
 
   /**
    * Return `true` if the given function body should be skipped because it is
    * the body of a top-level function, method or constructor.
    */
   bool _shouldBeSkipped(FunctionBody body) {
@@ skipping 5876 matching lines @@
     nonFields.add(node);
     return null;
   }
 
   @override
   Object visitNode(AstNode node) => node.accept(TypeResolverVisitor_this);
 
   @override
   Object visitWithClause(WithClause node) => null;
 }