[gnutls-devel] libtasn1 | asn1_decode_simple_der doesn't accept empty OCTET STRING (#48)

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Daiki Ueno created an issue: https://gitlab.com/gnutls/libtasn1/-/issues/48



## Description of problem:
While `asn1_encode_simple_der` seems to handle empty input, the result cannot be decoded with `asn1_decode_simple_der`, yielding DER_ERROR.

## Version of libtasn1 used:
libtasn1-4.19.0-3.fc39.x86_64

## Distributor of libtasn1 (e.g., Ubuntu, Fedora, RHEL)
Fedora

## How reproducible:

Steps to Reproduce:

 * compile a test [program](/uploads/5f0777f0c98a2160e9657a938e357cba/test-empty-octet-string.c), with:
```console
gcc -o test-empty-octet-string test-empty-octet-string.c `pkg-config libtasn1 --cflags --libs`
```
 * run it

## Actual results:
```console
non-empty: succeeded
empty: failed: DER_ERROR
```

## Expected results:
```console
non-empty: succeeded
empty: succeeded
```

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