If a whitespace-only description is set on an element, the CSS :empty
selector will not match, causing description icons to be shown when
there's no actual content.
To avoid that, trim the description string when building the element.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
(cherry picked from commit b6ae1d4f4aec94b38e59b11e5fd9c28799dae05b)
e06751f5a3