fix: account-ids-by-name fails on first run with empty array unbound variable error on macOS (bash 3.2)

[jrpbc]

Summary

When initially executing make infra-set-up-account ACCOUNT_NAME=<ACCOUNT_NAME> using bash (3.2), you would encounter the error below. This is a failure executing script account-ids-by-name when no *.tfbackend file exist yet in infra/account. Executing this in bash version 3.2 - trying to expand empty array ${key_value_pairs[*] is treated as an unbound variable, causing the crash. A possible fix is to change line 20 on bin/account-ids-by-name to safely handle an empty array.

Reproducibility

I tried multiple times and saw the bug every time

How to reproduce the bug

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