PolyGerrit: Unhide related changes if there all changes are non-visible
For the pathological case of having only non-visible changes, no update
was fired. This made the no visible submitted together changes test
fail as innerText was no longer trimmed, after adding an extension
point in a follow-up commit.
We fire the update event, even if there are only non-visible changes.
This sets the note about non-visible changes visible (as it should be)
and makes sure adding an extension point later on does not make tests