Crash when updating attribute with empty JSON Object

[fgalan]

Doing an update in existing entity like this:

curl 'localhost:1026/v2/entities/E/attrs?type=T' -H 'content-type: application/json' --data-raw '{
        "A": {
            "type": "object",
            "value": {}
	}
}'

Makes de broker to crash.

I think this bug was introduced in Orion 3.3.0 version. Previous versions are not affected.

[fgalan]

Probably also happens with "value": []

[fgalan]

Fixed in PR #3996 (master) and #3997 (release/3.3.0)