Note:
Because this also applies to module-level docstrings, a rather strange effect that, for example, `ast.parse("'foo'")` is now an empty module.
While the root node is always an instance of `ast.Module`, in practice `ast.parse()` is often used with smaller fragments of source code that don't directly correspond to a complete module, and this behaviour makes no sense in such cases.
The resulting bug in kdev-python took a while to track down (because I had no immediate reason to suspect this change), and will be somewhat awkward to workaround.
I would prefer that this be reverted; it's likely to break a variety of users in strange ways.