stats_wmh

I've had successful runs for bias_corr and seg_wmh on the files in data/test_case. However, I am unable to select a directory when running stats.wmh from the GUI.

When I run stats_wmh from the command line...
`hypermapper stats_wmh -i ../. -o ../wmh_vols_summary.csv`
I get the following error:
```
/home/WSL2user/anaconda3/envs/hypermapper/lib/python3.6/site-packages/nilearn/__init__.py:70: FutureWarning: Python 3.6 support is deprecated and will be removed in release 0.10 of Nilearn. Consider switching to Python 3.8 or 3.9.
_python_deprecation_warnings()
Using TensorFlow backend.
reading test_case
reading test_case2
Traceback (most recent call last):
File "/home/WSL2user/anaconda3/envs/hypermapper/bin/hypermapper", line 33, in
sys.exit(load_entry_point('HyperMapp3r', 'console_scripts', 'hypermapper')())
File "/home/WSL2user/software/HyperMapp3r/hypermapper/cli.py", line 164, in main
args.func(args)
File "/home/WSL2user/software/HyperMapp3r/hypermapper/cli.py", line 41, in run_wmh_seg_summary
summary_wmh_vols.main(args)
File "/home/WSL2user/software/HyperMapp3r/hypermapper/stats/summary_wmh_vols.py", line 68, in main
**cols = ['%s_Volume' % wmh_abb[0], '%s_Volume' % wmh_abb[1]]
IndexError: list index out of range**
```
Also, the hypermapper.log and wmh_seg_summary.log are blank even after successful bias_corr and seg_wmh runs?

Any help is appreciated!
Thank you