[PyQt] [BUG] QFileDialog::​getExistingDirectory() returns a dot(.) when canceled

[iMath]

for
QString QFileDialog::​getExistingDirectory(QWidget * parent = 0, const QString & caption = QString(), const QString & dir = QString(), Options options = ShowDirsOnly)‍


currently ,  If the user presses Cancel, it returns a dot(.), I think it should return an empty string or None.
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