Fails if 'report' not in book_config file.

[LeamHall]

Traceback (most recent call last):
File "/usr/local/bin/bookbot.py", line 439, in
if config["report"]:
~~~~~~^^^^^^^^^^
KeyError: 'report'

[LeamHall]

This is a holdover from TOML, but we need to make sure it doesn't happen in the new config file tool.