Added edge cases for empty input: - `mbc_raw_to_hex` - `mbc_hex_to_raw` - `mbc_encode_to_hex` - `mbc_decode_from_hex`
Added edge cases for empty input:
- `mbc_raw_to_hex`
- `mbc_hex_to_raw`
- `mbc_encode_to_hex`
- `mbc_decode_from_hex`

mttbernardini/mbc,mttbernardini/mbc