[Crash Report] Undo system crashes when redoing a shape's deletion

[Keavon]

Steps To Reproduce
Describe precisely how the crash occurred, step by step, starting with a new editor window.

1. Open the Graphite Editor at https://editor.graphite.design
2. Draw a shape such as an ellipse
3. Hit Delete
4. Undo (CtrlZ)
5. Redo(CtrlShiftZ), this causes the crash

Browser and OS
Chrome 96, Windows 10 or 11

Stack Trace
Copied from the crash dialog in the Graphite Editor:

panicked at 'called `Result::unwrap()` on an `Err` value: LayerNotFound', editor/src/document/document_file.rs:382:84

Error
 at https://editor.graphite.design/js/app.5d3a541f.js:1:14025
 at a (https://editor.graphite.design/js/app.5d3a541f.js:1:162234)
 at https://editor.graphite.design/js/chunk-7dc2b365.e94737f5.js:1:7234
 at O (https://editor.graphite.design/js/chunk-7dc2b365.e94737f5.js:1:4444)
 at Object.Nn (https://editor.graphite.design/js/chunk-7dc2b365.e94737f5.js:1:7197)
 at __wbg_handleJsMessage_1da694b6d316550a (https://editor.graphite.design/js/app.5d3a541f.js:1:1123)
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[167]:0x6d6fd
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[472]:0x93736
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[1088]:0xa347e
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[564]:0x99479
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[672]:0x9e082
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[836]:0xa1be1
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[860]:0xa20be
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[683]:0x9e610
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[154]:0x6a9f6
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[164]:0x6cd46
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[14]:0x141e5
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[21]:0x28934
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[137]:0x665b3
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[267]:0x7f139
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[505]:0x95cd8
 at https://editor.graphite.design/a173269e1afc432cfd93.module.wasm:wasm-function[849]:0xa1e88
 at Proxy.Y (https://editor.graphite.design/js/chunk-7dc2b365.e94737f5.js:1:5615)
 at Proxy.<anonymous> (https://editor.graphite.design/js/app.5d3a541f.js:1:7158)
 at F (https://editor.graphite.design/js/app.5d3a541f.js:1:10006)