Loïc Lecrenier a8641b42a7 Modify flatten_serde_json to keep dummy value for all object keys
Example:
```json
{
    "id": 0,
    "colour" : { "green": 1 }
}
```
becomes:
```json
{
    "id": 0,
    "colour" : [],
    "colour.green": 1
}
```
to retain the information the key "colour" exists in the original
json value.
2022-07-19 10:07:33 +02:00
..