title: Assetic generating empty files (symfony2 + less) on Windows
body: <p>I recently introduced Bootstrap + LessCSS in my Symfony2 installation.</p>
  
  <p>I'm using Assetic for assets management, with some filters: cssrewrite, yui_css, yui_js</p>
  
  <p>I was able to add the less filer with no pain on my Ubuntu machine and on a SUSE Linux server, but after setting up everything on some Windows 7 machines used by my colleagues, we're only getting empty files as output.</p>
  
  <p>I've already walked through <a href="https://stackoverflow.com/questions/8195114/symfony2-assetics-yui-compressor-on-windows-path-syntax">this</a> and <a href="https://stackoverflow.com/questions/9622960/how-to-use-scss-filter-in-symfony2-under-windows/9658410#9658410">this</a>, but nothing seems to work with 'less'.</p>
  
  <p>Please note that lessc command is working just fine if called from command line.</p>