Give a better message when Gemfile branch does not exist #6383
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What was the end-user or developer problem that led to this PR?
The error message when the branch in the Gemfile does not exist is too verbose, since the command is retried 3 times even if it will never succeed.
What is your fix for the problem, implemented in this PR?
Restore the good old Bundler 2.3 error.
This PR is analogous to #6356, but for non existent Gemfile branches.
Make sure the following tasks are checked