Ternary conditionals within F Strings Raise IndexError

**Example:**

yapf_example.py contents:
```python yapf_example.py

print(f"This Fails, but is legal: {"Should be fine" if True else "But it's not"}")
```

**Running Yapf:**
`python -m yapf yapf_example.py`

**Result:**

```
...
return '{}:{}:{}: {}'.format(e.args[1][0], e.args[1][1], e.args[1][2], e.msg)
~~~~~~^^^
IndexError: tuple index out of range
```

**Yapf version**
0.40.2 (Latest at time of writing)

This might be related to [PEP 701](https://github.com/google/yapf/issues/1136), but if memory serves, this has been an issue since before 3.12.