shows go back link only when history is available

What does this MR do?

This MR resolves UX of error page on GitLab regarding 'Go Back' Link

Are there points in the code the reviewer needs to double check?

Should not need

Why was this MR needed?

UX improvement

Screenshots (if relevant)

2017-02-08_16.41.57

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #27580 (closed)

Merge request reports

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