Fix the issue of Nil/Zero-length-byte-array value

[manish-sethi]

Signed-off-by: manish manish.sethi@gmail.com

Type of change

• Bug fix

Description

• The zero length byte array value from a node chaincode reaches the fabric as is, instead of as a nil as in the case of a chaincode in golang/java. This prevents current fabric code to set the delete marker in the write-set. This patch fixes this issue.
• During commit, the write-set that has a value nil/zero-lengh byte array is interpreted as delete.

Additional details

• The above issue is caused by the fact that unlike golanag and java chaincode shim, the protobuf library used by node shim is not google-protobuf but protobufjs which has a different behavior for the default values.
• Cherry-pick from PR-2305

Related issues

FAB-18386