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FIX: Empty string in commit message

Created by: elvanja

Fixed commit title when commit message is an empty string and ensured that link_to_gfm helper doesn't break on empty body.

This one is related to https://github.com/gitlabhq/gitlabhq/pull/1343, it breaks the commits project page. The previous solution didn't cover the situation where commit message is an empty string. In that case, the #title decorator method would return nil for the title, and the link_to_gfm helper would break.

Unfortunately, the "empty string" messages are a remnant of TFS repositories being converted. But, it could also be an issue with new commits (-m "").

Wasn't sure on how to approach since empty string is not nil, should it be considered a commit message or not. Chose to make it a "non message". Maybe you can change the decorator like this too:

  def title
    return no_commit_message unless safe_message

    title_end = safe_message.index(/\n/)
    if (!title_end && safe_message.length > 80) || (title_end && title_end > 80)
      safe_message[0..69] << "&hellip;".html_safe
    else
      safe_message.split(/\n/, 2).first || ""
    end
  end

As for the helper, it is just a minor update, to ensure that at least it won't break if somehow empty/nil string is passed into it.

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