make sure as is set before trying to build an #{as}_counter. [rails#2804 state:resolved]

Signed-off-by: Jeremy Kemper <[email protected]>

Author: Jeff Kreeftmeijer

actionpack/lib/action_view/render/partials.rb

@@ -248,7 +248,7 @@ def collection_with_template(template = @template)
 
         @collection.each do |object|
           locals[counter_name] += 1
-          locals["#{as.to_s}_counter".to_sym] = locals[counter_name]
+          locals["#{as.to_s}_counter".to_sym] = locals[counter_name] if as
           locals[as] = object
 
           segments << template.render(@view, locals)