Fix Import/Export error checking versions

Fixes small bug preventing the correct error message about Import/Export version being displayed.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/20536

• CHANGELOG entry added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together