Handle exception and clean-up code

pkg/analysis_server/lib/src/services/index/store/codec.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 services.src.index.store.codec;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/store/collection.dart';
@@ skipping 75 matching lines @@
    * Returns an [Element] that corresponds to the given location.
    *
    * @param context the [AnalysisContext] to find [Element] in
    * @param index an integer corresponding to the [Element]
    * @return the [Element] or `null`
    */
   Element decode(AnalysisContext context, int index) {
     List<int> path = _indexToPath[index];
     List<String> components = _getLocationComponents(path);
     ElementLocation location = new ElementLocationImpl.con3(components);
-    Element element = context.getElement(location);
-    return element;
+    return context.getElement(location);
   }
 
   /**
    * Returns a unique integer that corresponds to the given [Element].
    *
    * If [forKey] is `true` then [element] is a part of a key, so it should use
    * file paths instead of [Element] location URIs.
    */
   int encode(Element element, bool forKey) {
     ElementLocationImpl location = element.location;
@@ skipping 211 matching lines @@
   int encode(String name) {
     int index = nameToIndex[name];
     if (index == null) {
       index = _indexToName.length;
       nameToIndex[name] = index;
       _indexToName.add(name);
     }
     return index;
   }
 }