Indentation wart when removing an Arg from a Call - is whitespace being represented in the right place?

With the following transformer, and libcst `1.4.0`:

```python
example = """\
foo(
arg1=None,
)
"""

import libcst as cst

class DropArg(cst.CSTTransformer):
def leave_Arg(self, node: cst.Arg, update_node: cst.Arg):
return cst.RemoveFromParent()

result = cst.parse_module(example).visit(DropArg())
print(result.code)
```

The resulting code looks like:

```python
foo(
)

```

Is this a symptom of the whitespace/indentation being in the wrong place for Arg objects? Is there a good pattern to remove the whitespace above?