"Fix: This is a fix for Clicking anywhere generates JS warnings in Firefox if a dropdown menu is present Issue #7318

When jQuery receives an empty id selector like this `$("#")` , it throws an error in firefox. This error is visible only in the web console provided by firefox. I was not able to see it in firebug console. I have just added a if statement as a workaround for it.

Here is the diff

    --- a/js/bootstrap-dropdown.js
    +++ b/js/bootstrap-dropdown.js
    @@ -118,7 +118,11 @@
           selector = selector && /#/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') //st
         }
    
    -    $parent = selector && $(selector)
    +    if (selector === "#"){
    +      $parent = $("")
    +    } else {
    +      $parent = selector && $(selector)
    +    }

     if (!$parent || !$parent.length) $parent = $this.parent()


This is my first pull request hope I have done it right