tarantool / tarantool / 26526750515

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pickle: fixed abort on pack with empty format or string

`region_join()` and `region_alloc()` precondition of `size > 0`
is handled now and `pack()` successfully returns in the `format = ''`
or an empty string for the `'a'` format specifier cases.

Fixes #12063

NO_DOC=bugfix

(cherry picked from commit 02b416224)

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