utils/voyeur: zero Value is ok to use

utils/voyeur/value_test.go

Index: utils/voyeur/value_test.go 
=== modified file 'utils/voyeur/value_test.go' 
--- utils/voyeur/value_test.go	2014-02-07 20:04:18 +0000 
+++ utils/voyeur/value_test.go	2014-02-19 13:25:04 +0000 
@@ -211,5 +211,17 @@ 
	// prove the value is not closed, even though the watcher is 
	_, ok := v.Get() 
	c.Assert(ok, jc.IsTrue) 
+} 
 
+func (s *suite) TestWatchZeroValue(c *gc.C) { 
+	var v Value 
+	ch := make(chan bool) 
+	go func() { 
+	w := v.Watch() 
+	ch <- true 
+	ch <- w.Next() 
+	}() 
+	<-ch 
+	v.Set(struct{}{}) 
+	c.Assert(<-ch, jc.IsTrue) 
 }