Empty hyper files are created while saving

[yedugurinithish]

@goodwillpunning Thank you for creating such a wonderful tool.

When I use hf.save function, I get path of hyperfile. However, when I download the hyperfile it just shows headers and also if I use print_rows function, I get only 'Showing first 1,000 rows' as the result.

Can you please let me know if I am missing anything.