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Doc'd how ModelAdmin.list_display uses short_description.
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@ -641,6 +641,10 @@ subclass::
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:func:`~django.utils.html.format_html_join`, or
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:func:`~django.utils.safestring.mark_safe` instead.
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* As some examples have already demonstrated, when using a callable, a
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model method, or a ``ModelAdmin`` method, you can customize the column's
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title by adding a ``short_description`` attribute to the callable.
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* If the value of a field is ``None``, an empty string, or an iterable
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without elements, Django will display ``-`` (a dash). You can override
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this with :attr:`AdminSite.empty_value_display`::
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