title: A lot of options in Boostrap selectpicker make it blank
body: <p>I'm using js with bootstrap 1.13.9, my problem is: I have a selectpicker with more than 500 options, and if I go to the last item, it doesn't show it.</p>
  
  <p>ex in the img,</p>
  
  <p>Ps. look at the ul tag's style, the margin from top/bottom, it change from 68000px to 0px with just 1 scroll</p>
  
  <p><a href="https://i.stack.imgur.com/X7j1x.png" rel="nofollow noreferrer">Option before the last</a></p>
  
  <p><a href="https://i.stack.imgur.com/VkXrw.png" rel="nofollow noreferrer">Last option</a></p>