Fix combine_files.py

[acrosman]

Currently attempts to merge files into the processed.json file using combined_files.py triggers the following:

$ python combine_files.py 
/path/to/project/raw_data/FOIA Transparency Salary Data 1.2021.csv
Traceback (most recent call last):
  File "combine_files.py", line 34, in <module>
    file_date = re.match('.*([0-9]{8}).*csv$', listing).group(1)
AttributeError: 'NoneType' object has no attribute 'group'

[codewith-arijit]

Hi, is this issue open? Can I be assigned on it?

[acrosman]

Go for it.