[camera] Resolve example null exception (#2340)

* [Camera] Resolve example null exception
diff --git a/packages/camera/CHANGELOG.md b/packages/camera/CHANGELOG.md
index 84c05e9..016fcdb 100644
--- a/packages/camera/CHANGELOG.md
+++ b/packages/camera/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.5.7+1
+
+* Fix example null exception.
+
 ## 0.5.7
 
 * Fix unawaited futures.
diff --git a/packages/camera/example/lib/main.dart b/packages/camera/example/lib/main.dart
index 9383a20..ce8d374 100644
--- a/packages/camera/example/lib/main.dart
+++ b/packages/camera/example/lib/main.dart
@@ -474,7 +474,7 @@
   }
 }
 
-List<CameraDescription> cameras;
+List<CameraDescription> cameras = [];
 
 Future<void> main() async {
   // Fetch the available cameras before initializing the app.
diff --git a/packages/camera/pubspec.yaml b/packages/camera/pubspec.yaml
index 431e334..3eed53a 100644
--- a/packages/camera/pubspec.yaml
+++ b/packages/camera/pubspec.yaml
@@ -2,7 +2,7 @@
 description: A Flutter plugin for getting information about and controlling the
   camera on Android and iOS. Supports previewing the camera feed, capturing images, capturing video,
   and streaming image buffers to dart.
-version: 0.5.7
+version: 0.5.7+1
 
 authors:
   - Flutter Team <flutter-dev@googlegroups.com>