message: Fix a crash with the strip-restart handling code if draw is NULL
diff: @@ -1193,8 +1193,8 @@ void BufferViewer::OnEventChanged(uint32_t eventID)
  m_ModelVSOut->primRestart = 0;
  m_ModelGSOut->primRestart = 0;
  - if(m_Ctx.CurPipelineState().IsStripRestartEnabled() && (draw->flags & DrawFlags::UseIBuffer) &&
  - IsStrip(draw->topology))
  + if(m_Ctx.CurPipelineState().IsStripRestartEnabled() && draw &&
  + (draw->flags & DrawFlags::UseIBuffer) && IsStrip(draw->topology))
  {
  m_ModelVSIn->primRestart = m_Ctx.CurPipelineState().GetStripRestartIndex();
  