Executed status file may be corrupted in some cases

[innerr]

When an execution failed, the executed status file may be corrupted, The reason is related to using panic-recover to handle errors.

Command's status may be written during panic-recover, The error-handle-order is tricky, so lead to executed status file corrupting.

This commit https://github.com/innerr/ticat/commit/7497ae06d0b55e034d706964ebdb9c1ad162a2af tolerate corruptions. Futher works: better error handling.