slightly less failing test suite but removing the annoying 404 failures

spec/support/ember_helpers.rb

@@ -109,7 +109,7 @@ module SpecEmberHelpers
       ember_ready = page.evaluate_script('window.ember_ready')
       times += 1
     end
-    raise "Ember is not loaded and should be" unless ember_ready
+    raise "Ember is not loaded and should be. Current path is: #{page.current_path}" unless ember_ready
     blk.call
   end
 end