title: how to remove emty elements from tcl list
body: <p>hi 
  I have following list</p>
  
  <blockquote>
    <p>% set qprList {{{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} 12345 {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} 12345 {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} 12345
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}} {{}} {{}} 12345 {{}} {{}}
    {{}} {{}} {{}} {{}} {{}} {{}} {{}}
    {{}} {{}}}</p>
  </blockquote>
  
  <p>I want to remove all the elements which are empty. since list of list is i am not able to do it in single loop interation.</p>
  
  <p>Any simple way to achieve this?</p>