Obscure error is reported when OPENAI_API_KEY is not set

[artemmukhin]

Prerequisites

macOS 13.2.1

$ echo $OPENAI_API_KEY

$ python3 --version
Python 3.10.10

$ python3 -m pip install chatdbg

Steps to reproduce

$ python3 -m chatdbg -c continue testme.py

ZeroDivisionError: division by zero
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> ~/chatdbg/test/testme.py(4)tryme()
-> if x / i > 2:
(ChatDBG Pdb) why
EXCEPTION 'choices'

(ChatDBG Pdb)

It starts working after setting OPENAI_API_KEY

$ export OPENAI_API_KEY=<key>

$ python3 -m chatdbg -c continue testme.py

ZeroDivisionError: division by zero
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> ~/chatdbg/test/testme.py(4)tryme()
-> if x / i > 2:
(ChatDBG Pdb) why
The root cause of the error is that the code tries to divide by zero.
This occurs in the `tryme` function where `range(100)` includes the
value 0, and the code tries to divide by 0 on the line `if x / i >
2:`.

[emeryberger]

Thanks for the report and patch!