bug: DVoteGateway returns chainID undefined when chainID is actually ""

[randomshinichi]

As the node approaches this line
https://github.com/vocdoni/vocdoni-node/blob/74742a36aa987c0f7af15b2b3225f01866e61381/rpcapi/healthinfo.go#L21
It replies with chainID = "", but by the time you get it with dvoteGw.getVocdoniChainId(), it says undefined.

To see this problem for yourself run voconed with VSCode debugger, the config is as follows:

{
            "name": "runvocone",
            "type": "go",
            "request": "launch",
            "mode": "exec",
            // "preLaunchTask": "rmrfvoconed",
            "program": "${workspaceFolder}/voconed",
            "args": [
                "--treasurer=0xfe10DAB06D636647f4E40dFd56599da9eF66Db1c", "--oracle=...", "--txCosts=20", "--logLevel=debug"
            ]
        },

[randomshinichi]

Actually a bug in the node.