Slight improvement to failed upload spec

spec/session_spec.rb

@@ -538,6 +538,7 @@ shared_examples_for "session" do
 
       it "should not break if no file is submitted" do
         @session.click_button('Upload')
+        @session.body.should include('No file uploaded')
       end
     end
 

spec/test_app.rb

@@ -50,7 +50,7 @@ class TestApp < Sinatra::Base
   end
 
   post '/upload' do
-    params[:form][:document][:tempfile].read rescue ''
+    params[:form][:document][:tempfile].read rescue 'No file uploaded'
   end
 end