fix for zsh no-unset environments

[ds-cbo]

When I run atuin init zsh in my zshrc, I am greeted with

_atuin_precmd:3: ATUIN_HISTORY_ID: parameter not set

any time I boot my shell, because I also have set -o nounset to tell me when I'm accidentally using variables that don't exist, for example because of a typo.

This makes sure that error doesn't happen

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Name	Status	Preview	Comments	Updated (UTC)
atuin	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 10, 2023 8:57am