Unable to convert proto3 file to avrotize when enum is present

[agustinbonelli]

When trying to convert the following proto file:

syntax = "proto3";

enum Corpus {
CORPUS_UNSPECIFIED = 0;
CORPUS_UNIVERSAL = 1;
CORPUS_WEB = 2;
CORPUS_IMAGES = 3;
CORPUS_LOCAL = 4;
CORPUS_NEWS = 5;
CORPUS_PRODUCTS = 6;
CORPUS_VIDEO = 7;
}

The following error is encountered:

Error: Error trying to process rule "enumbody":

'NoneType' object has no attribute 'data'

Using version: Avrotize 2.6.0

Note: The proto definition should be valid protobuf syntax according to the docs (https://protobuf.dev/programming-guides/proto3/#enum)

The same proto definition but with syntax = "proto2" works properly and writes the schema:

[
{
"name": "Corpus",
"type": "enum",
"namespace": "Avrotest",
"symbols": [
"CORPUS_UNSPECIFIED",
"CORPUS_UNIVERSAL",
"CORPUS_WEB",
"CORPUS_IMAGES",
"CORPUS_LOCAL",
"CORPUS_NEWS",
"CORPUS_PRODUCTS",
"CORPUS_VIDEO"
],
"ordinals": {
"CORPUS_UNSPECIFIED": 0,
"CORPUS_UNIVERSAL": 1,
"CORPUS_WEB": 2,
"CORPUS_IMAGES": 3,
"CORPUS_LOCAL": 4,
"CORPUS_NEWS": 5,
"CORPUS_PRODUCTS": 6,
"CORPUS_VIDEO": 7
}
}
]