Don't panic on missing mtime (cherry-pick #9513) (#9514)
gcp-cherry-pick-bot[bot]
and
Conrad Irwin
created
Cherry-picked Don't panic on missing mtime (#9513)
This is expected as of zed 0.128 when a new unsaved file is created
Release Notes:
- Fixed a panic when collaborating with newer zed versions
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>