message: Fix a crash updating mesh preview columns when not in a mesh view
diff: @@ -1820,6 +1820,9 @@ void BufferViewer::guessSecondaryColumn(BufferItemModel *model)
  void BufferViewer::updatePreviewColumns()
  {
  + if(!m_MeshView)
  + return;
  +
  QVector<BoundVBuffer> vbs = m_Ctx.CurPipelineState().GetVBuffers();
  const DrawcallDescription *draw = m_Ctx.CurDrawcall();
  