improve lists:nth/2 function, deal with exceed condition

lists:nth(N, L). when N>L.length, there will be an exception, not that friendly like:
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lists:nth(1,[]).
** exception error: no function clause matching lists:nth(1,[]) (lists.erl, line 168)
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I improve the nth/2 function to deal with exceed condition, which I think, can make it more friend to handle.
e.g.
mylist:nth(1, []).
error_exceed
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thanks