Crash when navigating log / working set.

**Describe the bug**

Attempted to navigate a git repo, and gitui crashed. See repro steps for description of initial navigation attempts.

PanicHookInfo { payload: Any { .. }, location: Location { file: "asyncgit\\src\\revlog.rs", line: 186, col: 14 }, can_unwind: true, force_no_backtrace: false }
trace:
0: git_odb_object_data
1:
2: git_odb_object_data
3: git_odb_object_data
4: git_odb_object_data
5: git_odb_object_data
6: git_midx_writer_new
7: git_midx_writer_new
8: git_odb_object_data
GitUI was close due to an unexpected panic.
Please file an issue on https://github.com/extrawurst/gitui/issues with the following info:
11: git_midx_writer_new
Any { .. }odb_object_data
trace:git_odb_object_data
0: git_odb_object_data
1: dInitThunk
2: git_odb_object_data
3: git_midx_writer_new
4: git_odb_object_data
5: git_odb_object_data
6: git_odb_object_data
7: BaseThreadInitThunk
8: RtlUserThreadStart

Further attempts to load gitui on the same repo result in an immediate crash.

**To Reproduce**
Steps to reproduce the behavior:

Launched gitui.

Navigated down through changes.
Attempted to select a specific (deleted) file for review.
Encountered crash.

Now when relaunching gitui, encounter crash immediately.

**Expected behavior**
Not crash!

**Screenshots**
Pasted stack trace

**Context (please complete the following information):**
- OS/Distro + Version: [e.g. `macOS 10.15.5`]
- GitUI Version [e.g. `0.5`]
- Rust version: [e.g `1.44`]

- Windows 11 23H2 (OS Build 22631.5624)
- GitUI Version 0.27.0 2025-01-14
- Rust Version: rustc 1.86.0 (05f9846f8 2025-03-31)

Beginne bei asyncgit/src/revlog.rs Zeile 186 und reproduziere den Absturz, indem du zu einer gelöschten Datei im Arbeitsbestand des gemeldeten Repository navigierst. Vergleiche den anfänglichen Navigationsfehler mit dem unmittelbaren Absturz beim erneuten Start und überprüfe anschließend, dass GitUI beim Laden oder Überprüfen dieses Repositorys nicht mehr in Panik gerät.

Vom Indexierungsmodell aus dem Issue-Text verfasst.