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handles empty arrays in join_many - #3211
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af_join_many() would throw an exception when passed empty arrays. This was inconsistent with af_join().
With this PR, af_join_many() will ignore empty arrays.
bug fix
Now that empty arrays are allowed, the first non-empty array must be used for assertions.
Internal API has slightly changed to accept pre-allocated array. More functions will be moving to this style.
internal API of af_join() doesn't yet match af_join_many(&out)
Fixes: #3209
Changes to Users
No changes to existing code should be necessary, but join() with multiple arrays will now handle empty arrays.
Checklist