Fix a crash in the snapshot callback

packages/cloud_firestore/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.8.2+1
+
+* Avoid crash in document snapshot callback.
+
 ## 0.8.2
 
 * Added `Firestore.settings`

packages/cloud_firestore/ios/Classes/CloudFirestorePlugin.m

@@ -431,8 +431,8 @@ - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result
           [self.channel invokeMethod:@"DocumentSnapshot"
                            arguments:@{
                              @"handle" : handle,
-                             @"path" : snapshot.reference.path,
-                             @"data" : snapshot.exists ? snapshot.data : [NSNull null],
+                             @"path" : snapshot ? snapshot.reference.path : [NSNull null],
+                             @"data" : snapshot && snapshot.exists ? snapshot.data : [NSNull null],
                            }];
         }];
     _listeners[handle] = listener;

packages/cloud_firestore/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for Cloud Firestore, a cloud-hosted, noSQL database
   live synchronization and offline support on Android and iOS.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/cloud_firestore
-version: 0.8.2
+version: 0.8.2+1
 
 flutter:
   plugin: