Crash when editing an incomplete table in TMOL
### Version

moe v0.3.0

Git hash: 7002365f344cce534540eb31ec9945bb1ccfe025
Build type: Release

### Environment

_No response_

### Category

Major — The software does not fulfill the task it is designed for.

### Steps to Reproduce

1. `$ '[' > test.toml`
2. `moe test.toml`
3. `:2`
4. `dd`

### Detailed Description

_No response_