Improve how "no search results" is handled

* Drop the ugly height: 100% hack and do it properly and remove TODO
* after( $suggestions.show() ) seems to not work as expected in recent
  jQuery versions. Changed it to manipulate the presence of 'hide'
  class properly.
* Consistency fix in a comment
* Fixed a bug where creating multiple ULS instances would break the
  "no search results" functionality. This is because we were appending
  a jQuery element wrapped in a $(). This is obviously a no-op and a
  regression when the template actually was a string and not jQuery.
  Fixed by using clone() on it.

https://phabricator.wikimedia.org/T175233

css/jquery.uls.lcd.css

@@ -104,13 +104,6 @@
 	vertical-align: middle;
 }
 
-/* TODO: ugly hack that forces last matching search results to shift down.
- * They should be hidden properly.
- */
-.uls-no-results-view {
-	height: 100%;
-}
-
 .uls-no-results-found-title {
 	font-size: 16px;
 	padding: 0 16px 0 28px;