mongodb-js / devtools-shared / 42272147761

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fix(mongodb-runner): ignore a missing runnerDir in stop, ls, and prune commands (#951)

fix(mongodb-runner): treat a missing runnerDir as nothing to stop

`stop` iterated `fs.opendir(runnerDir)` and failed with ENOENT when a
`start` had failed before creating the directory. `instances()` now
returns no entries when the runner directory does not exist, so `stop`,
`ls`, and `prune` all exit cleanly.

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