message: use an empty cell as template when resizing grids
diff: @@ -863,7 +863,7 @@ impl Term {
  println!("num_cols, num_lines = {}, {}", num_cols, num_lines);
  // Resize grids to new size
  - let template = self.cursor.template;
  + let template = self.empty_cell;
  self.grid.resize(num_lines, num_cols, &template);
  self.alt_grid.resize(num_lines, num_cols, &template);
  