ServiceAccount does not work correctly

If you have a service account and you give access to it via the email. In this case, the file, when queried by drive looks like this:

{'id': 'some id here', 'name': 'some spreadheet name here'}]

This breaks here: https://github.com/aiguofer/gspread-pandas/blob/master/gspread_pandas/client.py#L256-L265

Since there is no parent, it raises an error, as it somehow expects said key to be there.

I hacked around that like this and it works:

    def _list_spreadsheet_files(self, q):
        files = self._query_drive(q)

        for f in files:
            try:
                parent = next(
                    d for d in self._dirs + [self._root] if d["id"] in f.get("parents", {})
                )
                f["path"] = parent.get("path", "/")
            except StopIteration:
                f["path"] = "/"

        return remove_keys_from_list(files, ["parents"])

I’m not really, really sure what I’m doing here, hence I didn’t make a PR. Happy to do so, if you think this would work.

[aiguofer]

Btw, I just pushed a new version which should include all the aformentioned changes.

[aiguofer]

Ahh, you were using your own scope I take it? I’ve added some checks now so it’ll still work and give you a message about the missing permissions (see https://github.com/aiguofer/gspread-pandas/commit/e8527fe56679088b333d66fa7c32c4a1e5b1db83).

Let me know if you have any other issues/suggestions/etc!