Fixes #2135 - During puppet class import, puppet class description box s...

...hould close itself
Why limit the height to only 50px? This allows only 2 classes to show without scrolling.
it would be better to set css({max-height: 90px, overflow-y: auto, overflow-x: hidden;}) - that way the scroll bar will only be displayed if there are more then 4 classes.
Also notice this only applies after the first click, the first click does not apply this styling.