luci-mod-system: Set description to blank if the trigger has none

In this case the cbi description div will not be generated and when
switching to another trigger later, attempts to change the description
div contents will fail.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
This commit is contained in:
Florian Eckert 2022-04-12 10:05:34 +02:00
parent 3ea1d08df8
commit 3de5446003