avoid retrying to download for FileNotFoundError

[codecov[bot]]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (bd71277) 71.04% compared to head (a6dfbfe) 57.43%.

:exclamation: Current head a6dfbfe differs from pull request most recent head fd298e2. Consider uploading reports for the commit fd298e2 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #409 +/- ## =========================================== - Coverage 71.04% 57.43% -13.62% =========================================== Files 31 31 Lines 3568 3580 +12 =========================================== - Hits 2535 2056 -479 - Misses 1033 1524 +491 ``` | [Files](https://app.codecov.io/gh/deepmodeling/dpdispatcher/pull/409?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling) | Coverage Δ | | |---|---|---| | [dpdispatcher/submission.py](https://app.codecov.io/gh/deepmodeling/dpdispatcher/pull/409?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBkaXNwYXRjaGVyL3N1Ym1pc3Npb24ucHk=) | `87.87% <0.00%> (-0.34%)` | :arrow_down: | | [dpdispatcher/ssh\_context.py](https://app.codecov.io/gh/deepmodeling/dpdispatcher/pull/409?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBkaXNwYXRjaGVyL3NzaF9jb250ZXh0LnB5) | `78.49% <16.66%> (-1.51%)` | :arrow_down: | ... and [7 files with indirect coverage changes](https://app.codecov.io/gh/deepmodeling/dpdispatcher/pull/409/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling)

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.