cards.py and scryfall_card_gen.py broken when no agruments

[Samega7Cattac]

When running cards.py without arguments the usage don't appear

• cards.py

  Traceback (most recent call last):
  File "cards.py", line 52, in <module>
  cards_db[(o["set"], o["collector_number"], o["lang"])] = convert(o)
  File "cards.py", line 38, in convert
  else [cf["image_uris"] for cf in o["card_faces"]],
  KeyError: 'card_faces'

• scryfall_card_gen.py:

  Traceback (most recent call last):
  File "scryfall_card_gen.py", line 9, in <module>
  version = sys.argv[1].strip("v")
  IndexError: list index out of range