strange behaviour of ets:tab2list with empty lists as key

[Nico Kruber]

Hi,
I see some strange behaviour of the ets:tab2list/1 function sometimes: running 
R13B04 and using empty lists, i.e. [], as keys in an ets table results in 
ets:tab2list (sometimes) duplicating the list. See the test_empty() function 
of the attached file.

Regards,
Nico Kruber
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