[PATCH] be more cautious when setting csl etc dir location

[Timothy]

Hello,

It's come to my attention that the current value of
org-cite-ctl--etc-dir is problematic for anyone managing Org with
package.el or straight. This patch adds a check to see if the initial
location actually exists, if it doesn't we try the expected location
when using package.el/straight.

-- 
Timothy

0001-oc-csl-be-more-caution-about-the-csl-etc-location.patch
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