Issue 21373. Fix for removing line info in case of exception (causes NPE in outline computer).

pkg/analysis_server/lib/src/analysis_server.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 analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 633 matching lines @@
                 sendAnalysisNotificationHighlights(this, file, dartUnit);
                 break;
               case AnalysisService.NAVIGATION:
                 // TODO(scheglov) consider support for one unit in 2+ libraries
                 sendAnalysisNotificationNavigation(this, file, dartUnit);
                 break;
               case AnalysisService.OCCURRENCES:
                 sendAnalysisNotificationOccurrences(this, file, dartUnit);
                 break;
               case AnalysisService.OUTLINE:
+                LineInfo lineInfo = context.getLineInfo(source);
                 sendAnalysisNotificationOutline(
                     this,
-                    context,
                     source,
+                    lineInfo,
                     dartUnit);
                 break;
               case AnalysisService.OVERRIDES:
                 sendAnalysisNotificationOverrides(this, file, dartUnit);
                 break;
             }
           }
         }
       }
     });
@@ skipping 265 matching lines @@
     // send the notification
     channel.sendNotification(
         new ServerErrorParams(
             true,
             exceptionString,
             stackTraceString).toNotification());
   }
 }
 
 typedef void OptionUpdater(AnalysisOptionsImpl options);