* calendar/todo-mode.el: Fix wrong-type-argument error when
marking multiple consecutive items. (todo-toggle-mark-item): Don't try to mark the empty lines at the end of the todo and done items sections. Note in doc string that items marked by passing a numeric prefix argument can include the last todo and first done items. (todo-mark-category): Don't try to mark the empty line between the todo and done items sections.
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