Ternary expression is split strangely.

With yapf 0.29.0, google style, I'm getting this:

```python
next_playable_unit = self._next_playable_unit_callback(
None if self._prepared_playable_unit_id is None else self.
_playable_units[self._prepared_playable_unit_id])
```

I was expecting something more like this:

```python
next_playable_unit = self._next_playable_unit_callback(
None if self._prepared_playable_unit_id is None
else self._playable_units[self._prepared_playable_unit_id])
```