Return RequestErrorCode.NO_INDEX_GENERATED for search/refactoring requests.

pkg/analysis_server/lib/src/search/search_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 search.domain;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analysis_server/src/search/element_references.dart';
 import 'package:analysis_server/src/search/type_hierarchy.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/src/generated/element.dart';
 
+
 /**
  * Instances of the class [SearchDomainHandler] implement a [RequestHandler]
  * that handles requests in the search domain.
  */
 class SearchDomainHandler implements protocol.RequestHandler {
   /**
    * The analysis server that is using this handler to process requests.
    */
   final AnalysisServer server;
 
@@ skipping 117 matching lines @@
     // prepare type hierarchy
     TypeHierarchyComputer computer = new TypeHierarchyComputer(searchEngine);
     List<protocol.TypeHierarchyItem> items = await computer.compute(element);
     protocol.Response response = new protocol.SearchGetTypeHierarchyResult(
         hierarchyItems: items).toResponse(request.id);
     server.sendResponse(response);
   }
 
   @override
   protocol.Response handleRequest(protocol.Request request) {
+    if (searchEngine == null) {
+      return new protocol.Response.noIndexGenerated(request);
+    }
     try {
       String requestName = request.method;
       if (requestName == SEARCH_FIND_ELEMENT_REFERENCES) {
         findElementReferences(request);
         return protocol.Response.DELAYED_RESPONSE;
       } else if (requestName == SEARCH_FIND_MEMBER_DECLARATIONS) {
         findMemberDeclarations(request);
         return protocol.Response.DELAYED_RESPONSE;
       } else if (requestName == SEARCH_FIND_MEMBER_REFERENCES) {
         findMemberReferences(request);
@@ skipping 25 matching lines @@
    */
   void _sendSearchResult(protocol.Request request, result) {
     protocol.Response response = result.toResponse(request.id);
     server.sendResponse(response);
   }
 
   static protocol.SearchResult toResult(SearchMatch match) {
     return protocol.newSearchResult_fromMatch(match);
   }
 }