[Bug]: Server emits LogStorageError exceptions when requesting logs for runs with no logs

[r4victor]

Steps to reproduce

0. Start the dstack server with file logs
1. Submit a run
2. While it's provisioning open run page
3. Observe dstack._internal.server.services.logs.base.LogStorageError: Failed to read log file in the server logs.

Actual behaviour

This happens if the server haven't yet created a file for run logs. So also relevant for failed to start runs. Seems to be introduced by #2845.

Expected behaviour

The server should return no logs if the logs haven't been written.

dstack version

master

Server logs

Additional information

No response