I added some logging to the verbose mode while the script parses the es_systems.cfg file. For each <system> it should list name, path, platform, and ext (all the required data) along with the number of files found within the path (not exactly the ROM count, since it looks for any file rather than matching the extension, but it should be good enough for debugging).

Just update the script with a
$ git pull

and run with the -v flag
$ python scraper.py -pisize -v -l