Remove #tap.

@reinh points out that this is a bug

lib/draper/view_context.rb

@@ -1,12 +1,12 @@
 module Draper
   module ViewContext
     def self.current
-      Thread.current[:current_view_context].tap do |context|
-        context ||= ApplicationController.new.view_context
-        context.controller.request ||= ActionController::TestRequest.new
-        context.request            ||= context.controller.request
-        context.params             ||= {}
-      end
+      context = Thread.current[:current_view_context]
+      context ||= ApplicationController.new.view_context
+      context.controller.request ||= ActionController::TestRequest.new
+      context.request            ||= context.controller.request
+      context.params             ||= {}
+      context
     end
 
     def self.current=(input)