Don't reset the session when the example failed to fix capybara-screenshot
As of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12224, capybara-screenshot doesn't give us HTML and image links for failed examples anymore. This fixes that.
Pick into Stable because https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12224 had that too.
/cc @rymai
Edited by Douwe Maan