If a Python-based extension is installed in LibreOffice, and JRE is disabled in Advanced options, an "Enable JRE?" warning is shown at LibreOffice startup.
As a Python-based extension example, you might try APSO . Note that it might hand LibreOffice when tried to install first time. I had to kill soffice and re-run installation (without removing the incomplete installation) to successfully finish the installation.
Mike Kaganski committed a patch related to this issue.
It has been pushed to "master":
tdf#120363: try to avoid asking user to enable JVM when looking ...
It will be available in 6.2.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.