Ensure NoMethodError propogates correctly.

When a delegated method calls a non-existant method the correct
NoMethodError should be called. If the NoMethodError is swallowed by
the decorator it can cause problems with BDD workflow.

lib/draper/base.rb

@@ -197,8 +197,9 @@ def method_missing(method, *args, &block)
             model.send(method, *args, &block)
           end
           self.send(method, *args, &block)
-        rescue NoMethodError
-          super
+        rescue NoMethodError => no_method_error
+          super if no_method_error.name == method
+          raise no_method_error
         end
       else
         super

spec/draper/base_spec.rb

@@ -551,6 +551,18 @@ class DecoratorWithDeniesAndAllows < Draper::Base
         subject.hello_world
       end
     end
+
+    context "when the delegated method calls a non-existant method" do
+      it "raises the correct NoMethodError" do
+        begin
+          subject.some_action
+        rescue NoMethodError => e
+          e.name.should_not == :some_action
+        else
+          fail("No exception raised")
+        end
+      end
+    end
   end
 
   describe "#kind_of?" do

spec/support/samples/product.rb

@@ -45,6 +45,10 @@ def title
     "Sample Title"
   end
 
+  def some_action
+    self.nonexistant_method
+  end
+
   def block
     yield
   end