img_prep 'File {} was ignored' not actually ignoring files?

[GLawsonDuck]

I have repeatedly run across an issue of the preprocessing step failing partway through. As far as I can tell, this is due to a Windows-created desktop.ini file being flagged as 'ignored' but failing to actually be ignored:

File ./Photos\desktop.ini was ignored
File "C:\Users\\ML-Morph\ml-morph-v.1.0.0\preprocessing.py", line 17, in
file_sizes=utils.split_train_test(args['input_dir'])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\\ML-Morph\ml-morph-v.1.0.0\utils.py", line 245, in split_train_test
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^`
File "C:\Users\*\ML-Morph\ml-morph-v.1.0.0\utils.py", line 267, in image_prep
return file_sz
^^^^^^^

UnboundLocalError: cannot access local variable 'file_sz' where it is not associated with a value

The return statement fails due to 'file_sz' not existing.

The following slight modification appears to fix the issue and allow the extraneous file to actually get ignored:

(This is within utils.py)

def image_prep(file, name, dir_path):

Internal function used by the split_train_test function. Reads the original image files and, while 
converting them to jpg, gathers information on the original image dimensions. 

Parameters:
    file(str)=original path to the image file
    name(str)=basename of the original image file
    dir_path(str)= directory where the image file should be saved to
    
Returns:
    file_sz(array): original image dimensions

img = cv2.imread(file)
if img is None:
    print('File {} was ignored'.format(file))
    ****file_sz = [0, 0] #give the return statement something so it won't just fail? GLD****
else:
    file_sz= [img.shape[0],img.shape[1]]
    cv2.imwrite(os.path.join(dir_path,name), img)
return file_sz