Docker images and pip installs have no .git directory, so _check_repo
returned None and the frontend interpreted both update-target parts being
falsy as "Up to date" — a stale Docker image would misleadingly look
current. _check_repo now returns a minimal sentinel dict ({name, behind:
None, no_git: True}) instead of None so the Settings panel can distinguish
"can't check" from "up to date", and _formatUpdateTargetStatus /
checkUpdatesNow surface a localized "Can't check for updates" state
(settings_update_no_git, added across all 13 locale blocks). In mixed
deployments where one component has a git checkout and the other does not,
the valid git-side update info is still shown. The sentinel's behind: None
flows safely through the existing notification/summary builders, which all
gate on int(info.get('behind') or 0) > 0.
Co-authored-by: Rod Boev <rod.boev@gmail.com>
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