clp-s missing support for empty json objects - exits with error on decompression

[AVMatthews]

Bug

If you try to compress and then extract an empty json object, clp-s issues the following errors.

2024-09-09T17:59:45.756-04:00 [error] FileWriter not closed before being destroyed - may cause data loss
2024-09-09T17:59:45.757-04:00 [error] src/clp_s/ZstdDecompressor.cpp:43  Error code: 1

CLP version

9537fde

Environment

macOS 12.5

Reproduction steps

To reproduce the error, try the following commands with the empty json file.
test-empty.json

./clp-s c test-archive test-empty.json
./clp-s x test-archive test-decompress

[gibber9809]

clp-s no longer has this bug, and it appears it hasn't for some time but we missed closing this issue.

[gibber9809]

Actually re-opening because this is also intended to cover empty files, which doesn't seem to be fixed.

[junhaoliao]

related issues: #1993 #2063