each-* will now check for null on null array [Closes #110]

@@ -339,6 +339,7 @@ Rivets.binders =
 
 
       @iterated = []
       @iterated = []
 
 
+      if collection
         for item in collection
         for item in collection
           data = {}
           data = {}
           data[n] = m for n, m of @view.models
           data[n] = m for n, m of @view.models