The commas are needed because that are tuples, not lists:
>>> tpl = ('a')
>>> type(tpl)
<type 'str'>
>>> tpl = ('a',)
>>> type(tpl)
<type 'tuple'>
Of course:
>>> tpl = ('a', 'b')
>>> type(tpl)
<type 'tuple'>
So for a tuple with more than one value the last comma could be omitted. To be
clear i left them.
See also:
https://docs.djangoproject.com/en/1.8/ref/contrib/admin/#django.contrib.admin.ModelAdmin.fieldsets
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