Stub find_template so that when handle_render_error is called in ActionView::Template, we get to see the actual underlying error rather than a NoMethodError.

This shows an encoding bug on Ruby 1.9.3.

actionpack/test/template/template_test.rb

@@ -8,6 +8,9 @@ class TestERBTemplate < ActiveSupport::TestCase
     def disable_cache
       yield
     end
+
+    def find_template(*args)
+    end
   end
 
   class Context