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null array[*] expansion not treated as null

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  null array[*] expansion not treated as null Grisha Levit <grishalevit@gmail.com> - 2018-11-12 16:32 -0500

#14805 — null array[*] expansion not treated as null

When an array A has non-zero elements but the expansion of "${A[*]}" is
still
a null string, it is not treated as such for purposes of ${var:-X} expansion
(though $* is treated as null in the same circumstance).

    $ A=(''); set -- ''
    $ echo "<${A[*]:-X}>" "<${*:-X}>"
    <> <X>

    $ IFS=
    $ A=('' ''); set -- '' ''
    $ echo "<${A[*]:-X}>" "<${*:-X}>"
    <> <X>

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