From f4d366e1882cfbae7ccda2e7a601b9fa5da09bdb Mon Sep 17 00:00:00 2001
From: voevodskiy <voevodskiy@yandex-team.com>
Date: Wed, 16 Apr 2025 10:55:30 +0300
Subject: Fix bug in proto2json map empty keys serialization
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`<library/cpp/protobuf/json/proto2json.h>` неправильно сериализует пустой ключ protobuf'ной map'ы

```
message TMyMessage {
    map<string, string> Fields = 1;
}
```

При таком протобуфе

```
Fields { key: "" value: "1" }
```

Сейчас получается json

```
{
    "value": "1"
}
```

Хотя должен получаться такой

```
{
    "": 1
}
```
commit_hash:e678bffbda1a062fa0fcaaba65c2e5f6bf13d558
---
 library/cpp/protobuf/json/proto2json_printer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/cpp/protobuf/json/proto2json_printer.cpp b/library/cpp/protobuf/json/proto2json_printer.cpp
index a9f8c3fce99..706b3b8c628 100644
--- a/library/cpp/protobuf/json/proto2json_printer.cpp
+++ b/library/cpp/protobuf/json/proto2json_printer.cpp
@@ -253,7 +253,7 @@ namespace NProtobufJson {
                                               bool inProtoMap) {
         Y_ABORT_UNLESS(!field.is_repeated(), "field is repeated.");
 
-        if (!key) {
+        if (!key && !inProtoMap) {
             key = MakeKey(field);
         }
 
-- 
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