fix($cacheFactory): return undefined when removing non-existent entry

Instead of throwning an exception, remove should return undefined when
cache entry to be removed doesn't exist.

Closes #1497

1 files changed, 5 insertions, 0 deletions

diff --git a/test/ng/cacheFactorySpec.js b/test/ng/cacheFactorySpec.js
index dc68b63d..88e8e523 100644
--- a/test/ng/cacheFactorySpec.js
+++ b/test/ng/cacheFactorySpec.js
@@ -89,6 +89,11 @@ describe('$cacheFactory', function() {
       }));
 
 
+      it('should return undefined when entry does not exist', inject(function($cacheFactory) {
+        expect(cache.remove('non-existent')).toBeUndefined();
+      }));
+
+
       it('should stringify keys', inject(function($cacheFactory) {
         cache.put('123', 'foo');
         cache.put(123, 'bar');