Merge pull request #34 from mscottford/filter_unauthorized_to_sym_fix

Prevents to_sym getting called on nil from within Filter#unauthorized!

lib/casclient/frameworks/rails/filter.rb

@@ -218,7 +218,10 @@ def logout(controller, service = nil)
           end
 
           def unauthorized!(controller, vr = nil)
-            format = controller.request.format.to_sym
+            format = nil
+            unless controller.request.format.nil?
+              format = controller.request.format.to_sym
+            end
             format = (format == :js ? :json : format)
             case format
             when :xml, :json

spec/casclient/frameworks/rails/filter_spec.rb

@@ -182,4 +182,21 @@ def mock_post_request
       end
     end
   end
+
+  context "controller request is missing format" do
+    context "#unauthorized!" do
+      it 'should not crash' do
+        request = double('mock request')
+        request.stub(:format).and_return(nil)
+
+        controller = controller_with_session(request)
+
+        CASClient::Frameworks::Rails::Filter.
+          should_receive(:redirect_to_cas_for_authentication).
+          with(controller)
+
+        CASClient::Frameworks::Rails::Filter.unauthorized!(controller)
+      end
+    end
+  end
 end