Skip spec before doing any requests

Skipping a spec in the middle of it, particularly after doing some
requests, caused Capybara to keep using the same driver in the following
spec.

Since the current spec uses the JavaScript driver, the next test would
also use the JavaScript driver, causing apparently random failures if
that test was supposed to use the Rack driver.

spec/shared/features/nested_imageable.rb

@@ -175,15 +175,14 @@ shared_examples "nested imageable" do |imageable_factory_name, path,
     end
 
     scenario "Should show successful notice when resource filled correctly without any nested images", :js do
-      login_as user
-      visit send(path, arguments)
-
-      send(fill_resource_method_name) if fill_resource_method_name
-      click_on submit_button
-
       if has_many_images
          skip "no need to test, there are no attributes for the parent resource"
       else
+        login_as user
+        visit send(path, arguments)
+
+        send(fill_resource_method_name) if fill_resource_method_name
+        click_on submit_button
         expect(page).to have_content imageable_success_notice
       end
     end