message: Return an empty MeshFormat for GetPostVSData on invalid drawcall
diff: @@ -390,7 +390,10 @@ bool ReplayRenderer::GetPostVSData(uint32_t instID, MeshDataStage stage, MeshFor
  RDCEraseEl(ret);
  if(draw == NULL || (draw->flags & eDraw_Drawcall) == 0)
  + {
  + *data = MeshFormat();
  return false;
  + }
  instID = RDCMIN(instID, draw->numInstances - 1);
  