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That change allow to display error messages provided by API server
That is a part of email check feature gitlabhq/gitlabhq#8242
When user is trying to do the "PUSH" operation, the Gitlab server perform the check of user's e-mail address within the existing Gitlab user database.
If user's e-mail does not exist, then Gitlab does not allow to "PUSH" and display the corresponding message "User is not allowed to PUSH due to invalid e-mail address, please, use your registered e-mail address".
To make error message displayed corresponding pull request to the repository gitlab-shell has been created