Don't send a refactoring feedback in case of a fatal initial problem.

pkg/analysis_server/lib/src/edit/edit_domain.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 edit.domain;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/collections.dart';
@@ skipping 236 matching lines @@
     // prepare for processing the request
     requestId = request.id;
     result = new EditGetRefactoringResult(
         EMPTY_PROBLEM_LIST,
         EMPTY_PROBLEM_LIST,
         EMPTY_PROBLEM_LIST);
     // process the request
     var params = new EditGetRefactoringParams.fromRequest(request);
     _init(params.kind, params.file, params.offset, params.length).then((_) {
       if (initStatus.hasFatalError) {
+        feedback = null;
         return _sendResultResponse();
       }
       // set options
       if (_requiresOptions) {
         if (params.options == null) {
           optionsStatus = new RefactoringStatus();
           return _sendResultResponse();
         }
         optionsStatus = _setOptions(params);
         if (_hasFatalError) {
@@ skipping 179 matching lines @@
     offset = null;
     length = null;
     refactoring = null;
     feedback = null;
     initStatus = new RefactoringStatus();
     optionsStatus = new RefactoringStatus();
     finalStatus = new RefactoringStatus();
   }
 
   void _sendResultResponse() {
-    if (feedback != null) {
-      result.feedback = feedback;
-    }
+    result.feedback = feedback;
     // set problems
     result.initialProblems = initStatus.problems;
     result.optionsProblems = optionsStatus.problems;
     result.finalProblems = finalStatus.problems;
     // send the response
     server.sendResponse(result.toResponse(requestId));
     // done with this request
     requestId = null;
     result = null;
   }
@@ skipping 33 matching lines @@
     }
     if (refactoring is RenameRefactoring) {
       RenameRefactoring renameRefactoring = refactoring;
       RenameOptions renameOptions = params.options;
       renameRefactoring.newName = renameOptions.newName;
       return renameRefactoring.checkNewName();
     }
     return new RefactoringStatus();
   }
 }