title: Three.js Error: no keyframes in track named [objectname].position
body: <p>Exporting from Blender <a href="https://sport.xbe.at/jsonPlayer/index.html" rel="nofollow noreferrer">this animation</a> in three.js format i get this error: "Error: no keyframes in track named Mesh.position". The Blender file have all the orphan data purged. I noticed that at bottom of exported <a href="https://sport.xbe.at/jsonPlayer/Player_animated_separated.json" rel="nofollow noreferrer">json file</a> there's a section with a empty animations:</p>
  
  <pre><code>"animations":[{
      "tracks":[{
          "type":"vector3",
          "name":"Mesh.position",
          "keys":[]
      },{
          "type":"vector3",
          "name":"Mesh.scale",
          "keys":[]
      },{
          "type":"quaternion",
          "name":"Mesh.quaternion",
          "keys":[]
      }],
      "name":"default",
      "fps":30
  }]
  </code></pre>
  
  <p>If removed all worked correctly: it's a bug in the exporter or some parameters that i missing in the <a href="https://sport.xbe.at/jsonPlayer/Player_animated_separated.blend" rel="nofollow noreferrer">Blender file</a>?</p>
  
  <p>Parameters used for exportation:</p>
  
  <p><a href="https://i.stack.imgur.com/PA89B.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PA89B.jpg" alt="enter image description here"></a></p>