Describe the issue:

Thanks to the --pre wheels, our CIs found some issues with (what I assume is) the loadtxt change to C.

Reproduce the code example:

1. Running np.loadtxt(fname, skiprows=1) on this file or this file both used to work fine, now we get:

   mne\chpi.py:84: in read_head_pos
       data = np.loadtxt(fname, skiprows=1)  # first line is header, skip it
   C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\lib\npyio.py:1321: in loadtxt
       arr = _read(fname, dtype=dtype, comment=comment, delimiter=delimiter,
   C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\lib\npyio.py:999: in _read
       arr = _load_from_filelike(
   E   ValueError: could not convert string '' to float64 at row 0, column 11.
   

2. Running with open(egi_txt_fname) as fid: data = np.loadtxt(fid) on this file used to work fine, now we get:

   C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\lib\npyio.py:1321: in loadtxt
       arr = _read(fname, dtype=dtype, comment=comment, delimiter=delimiter,
   C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\lib\npyio.py:999: in _read
       arr = _load_from_filelike(
   E   ValueError: could not convert string '' to float64 at row 0, column 78.
   

Error message:

No response

NumPy/Python version information:

Platform: Windows-10-10.0.17763-SP0
Python: 3.9.9 (tags/v3.9.9:ccb0e6a, Nov 15 2021, 18:08:50) [MSC v.1929 64 bit (AMD64)]
numpy: 1.23.0.dev0+735.g4c60b3263