db password of sample config causing errors

[michael1011]

When using the sample config of the readme xud fails to start because of this error:

(node:27008) UnhandledPromiseRejectionWarning: Error: Parsing error on line 3, column 12: Expected "'", "'''", "+", "-", "[", "\"", "\"\"\"", "_", "false", "true", "{", [ \t] or [0-9] but "n" found.
    at Config.<anonymous> (/home/michael/Git/JavaScript/xud/dist/lib/Config.js:88:27)
    at Generator.next (<anonymous>)
    at /home/michael/Git/JavaScript/xud/dist/lib/Config.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/home/michael/Git/JavaScript/xud/dist/lib/Config.js:3:12)
    at Config.load (/home/michael/Git/JavaScript/xud/dist/lib/Config.js:76:16)
    at Xud.<anonymous> (/home/michael/Git/JavaScript/xud/dist/lib/Xud.js:42:31)
    at Generator.next (<anonymous>)
    at /home/michael/Git/JavaScript/xud/dist/lib/Xud.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/home/michael/Git/JavaScript/xud/dist/lib/Xud.js:3:12)
    at Xud.start (/home/michael/Git/JavaScript/xud/dist/lib/Xud.js:41:16)
    at Object.<anonymous> (/home/michael/Git/JavaScript/xud/bin/xud:95:5)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:612:3
(node:27008) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 3)
(node:27008) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

My config:

[db]
username="xud"
password = null
databse = "xud"
port = 3306
host = "localhost"

It is working fine when password = null is replaced with password = "". Could some add this to a pr? Creating a new one for a single line is kinda overkill.

I am using Ubuntu 18.04, MariaDB 10.1.29 and Node 8.11.2.

[sangaman]

It looks like this is really more of an issue with the documentation than the code. TOML doesn't play nice with null. Removing the password line from your config file should work perfectly fine, as should setting it to an empty string. I'll just update our readme directly, keeping the password line there but using "" instead of null to make it clear that it is an available config option.