FileNotFoundError: [Errno 2] No such file or directory upon canceling Save As action

[NejcHirci]

Error occurs after selecting MCNP test run, reading tallies and cancelling Save As action in popped up file browser. Also consider removing type selection if it saves as txt regardless and save as type can't be selected.

Console output

FileNotFoundError: [Errno 2] No such file or directory: ''
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Toxic\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
  File "C:\Users\Toxic\Documents\GitHub\MCNP-tally-table\tally_table.py", line 239, in SaveAs
    o2 = open(output_name, 'w')
FileNotFoundError: [Errno 2] No such file or directory: ''