TypeError thrown using default options

[tlvince]

path.js:360
        throw new TypeError('Arguments to path.join must be strings');
        ^
TypeError: Arguments to path.join must be strings
    at path.js:360:15
    at Array.filter (native)
    at Object.exports.join (path.js:358:36)
    at /Users/tom/Projects/src/chrome/ehealth/direct-delivery/node_modules/favicons/index.js:321:76
    at /Users/tom/Projects/src/chrome/ehealth/direct-delivery/node_modules/favicons/index.js:88:24
    at /Users/tom/Projects/src/chrome/ehealth/direct-delivery/node_modules/favicons/index.js:79:24
    at ChildProcess.exithandler (child_process.js:646:7)
    at ChildProcess.emit (events.js:98:17)
    at maybeClose (child_process.js:756:16)
    at Socket.<anonymous> (child_process.js:969:11)

[haydenbleasel]

Yeah that's a pretty shit error message. We'll discuss this on the PR.