Nothing to do if false one-time if

R=arv
BUG=

Review URL: https://codereview.appspot.com/49370043

Author: rafaelw

src/TemplateBinding.js

@@ -807,7 +807,7 @@
 
         // oneTime if & predicate is false. nothing else to do.
         if (deps.ifOneTime && !deps.ifValue)
-          this.updateIteratedValue();
+          return this.updateIteratedValue();
 
         if (!deps.ifOneTime)
           deps.ifValue.open(this.updateIteratedValue, this);