title: Libgdx html (gwt) font error - Invalid page id
body: <p>When I try to run html application I get this error in browser:</p>
  
  <pre><code>GwtApplication: exception: Error loading font file: fonts/comic-en.fnt
  Error loading font file: fonts/comic-en.fnt
  Invalid page id:
  For input string: ""
  </code></pre>
  
  <p>Android build runs always successfully, the font file is correct. This bug happens  even while running libgdx sample projects. Is there some secret magic?</p>