log OSErrors failing to create less-critical files during startup #3384
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rather than fatal errors
we can't solve every problem (e.g. the nbsignature db is required to function properly), but this makes it a little less likely to give up when the disk is full, giving users a better chance to recover space by launching a terminal.
coming up with full disks in jupyterhub deployments: jupyterhub/zero-to-jupyterhub-k8s#518