document how to check if a variable is unset

[xenoterracide]

I could swear I used to do this somewhere...

https://yadm.io/docs/templates#

{% if yadm.class == "" %}
{% else %}
{% include "../extra/gitconfig.{{ yadm.class }}.ini" %}
{% endif %}

/home/xeno/.config/yadm/alt/.gitconfig##template,e.ini:37: error: could not read '/home/xeno/.config/yadm/alt/../extra/gitconfig..ini'

funny because I run zsh

bash version 5.2.21(1)-release
 git version 2.43.0
yadm version 3.2.2

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[github-actions[bot]]

This issue was closed because it has been labeled as stale for 7 days with no activity.