TST: Nan must not be converted to string using .loc (#45695)
TST: Nan must not be converted to string using .loc (#45695)

* TST: Nan must not be converted to string

Closes #28403

* TST: Add test specific to the issue  #28403

* TST: Parametrize multiple inputs change nan loc
pandas-dev/pandas,datapythonista/pandas,datapythonista/pandas,datapythonista/pandas,pandas-dev/pandas,pandas-dev/pandas,pandas-dev/pandas,datapythonista/pandas