[hailtop.utils]test for file none (#11388)
[hailtop.utils]test for file none (#11388)

* added test

* added other test

* test passed

* addressed comments
hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail