[1pt] Seems that error can be ignored in some cases of `crud.select`

[filonenko-mikhail]

There is tuple iteration
And here we first check tuple and than error.

https://github.com/tarantool/crud/blob/master/crud/select/compat/select_old.lua#L211

In other places it's done better way:

        local tuple, err = iter:get()
        if err ~= nil then
            return nil, SelectError:new("Failed to get next object: %s", err)
        end

        if tuple == nil then
            break
        end