From 4614e93cac95140f430d1b5a63d28325c7ca1245 Mon Sep 17 00:00:00 2001
From: ENDOH takanao <djmchl@gmail.com>
Date: Tue, 10 Mar 2015 07:52:17 +0800
Subject: [PATCH] fix NoSuchMethodError in filter

I got errors when using `filter` for objects that is nullable.
I seem to be no substantial problem.
However, I want to suppress unwanted errors.

```
The null object does not have a method 'toList'.

NoSuchMethodError: method not found: 'toList'
Receiver: null
Arguments: [growable: false]

STACKTRACE:
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#1      Filter.call (package:angular/formatter/filter.dart:193:26)
...
```
---
 lib/formatter/filter.dart | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/formatter/filter.dart b/lib/formatter/filter.dart
index 5cc8fe503..a5a55e2a3 100644
--- a/lib/formatter/filter.dart
+++ b/lib/formatter/filter.dart
@@ -189,6 +189,9 @@ class Filter implements Function {
   }
 
   List call(List items, var expression, [var comparator]) {
+    if (items == null) {
+      return const [];
+    }
     if (expression == null) {
       return items.toList(growable: false); // Missing expression → passthrough.
     } else if (expression is! Map && expression is! Function &&