Handle Gitaly error on fetching total-branches for pipeline editor
What does this MR do and why?
When fetching total-branches for pipeline editor data, it needs to call Gitaly. And sometimes, Gitaly returns an error. This MR fixes it by checking if the repository exists.
- Related info: #349975 (comment 838535928)
- Bug issue: #349975 (closed)
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Edited by Furkan Ayhan