Not fixing E301

Running yapf, It seems to not fix ```E301``` when there's a docstring over a method. In fact, running the formatter removes the space if one manually adds it.

For example:
```
class MyClass(SuperClass):
"""Helper."""

TUPLE = (6, 8)
"""
Args:
Random Docsstring:
"""

def __init__(self, params):
super().__init__()
self.params = params

```
Giving the above will make yapf remove the blank line above ```__init__```. Yapf should also add a blank line above ```__init__``` if there is none.