Fixing fails to deliver bug and resulting NaN values in dataframe bug

[simmonsj330]

Description

Fixes #1904 where an HTTP 404 error was occurring due to bad .zip download links to the SEC website. There were a handful of .zip files with very slightly different links than the rest of the urls. An additional bug was found and fixed where when reading the csv from the zip file it could not convert NaN values to int.

Tested with the following which resulted in a yaml file rewrite:
pytest /Users/jamessimmons/Desktop/OpenBB/OpenBBTerminal/tests/openbb_terminal/stocks/dark_pool_shorts/test_sec_model.py --record-mode=rewrite

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[piiq]

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