Dropdown: jQuery throws with empty ID selector

Created by: gpakosz

Hello,

While following the documentation, I've stumbled upon Dropdown examples: http://getbootstrap.com/javascript/#via-data-attributes-1

<div class="dropdown">
  <a id="dLabel" data-target="#" href="http://example.com" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
    Dropdown trigger
    <span class="caret"></span>
  </a>

  <ul class="dropdown-menu" aria-labelledby="dLabel">
    ...
  </ul>
</div>

When trying it with jQuery v2.1.3, everything works fine and clicking the anchor displays the dropdown.

However, when using jQuery v3.1.0 clicking the anchor follows the link.