tarantool / crud / 6466242484

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api: return error if no tuples/objects

Before this patch, the behavior of `*_many` requests if empty array of
tuples/objects were rather confusing. For example, due to format
processing all `*_object_many` operations resulted in `nil, {}` --
error request with zero errors. `insert_many` and `replace_many` calls
result in `nil, nil` -- no result, no error. `upsert_many` results in
`{metadata = metadata}, nil` with no `rows` in response. Thus, for all
six `*_many` calls trying to execute the request with empty array on
input result in malformed response.

After this patch, trying to run `*_many` request with empty array of
tuples/objects will result in `nil, {err}`, similar to existing
`*_many` API. Single tuple crud API already does not allow to run with
no tuples/objects.

Closes #377

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