TypeError: Cannot set property 'pot-creation-date' of undefined

Not quite sure why I get this failure, I suspect it might have to do with I have some older files ?

```
TypeError: Cannot set property 'pot-creation-date' of undefined
    at Object.gen [as generate] (/Users/kaareal/Code/closeterie/node_modules/jsxgettext/lib/jsxgettext.js:93:39)
    at module.exports (/Users/kaareal/Code/closeterie/lib/grunt/gettext.js:40:31)
    at async.forEach (/Users/kaareal/Code/closeterie/node_modules/grunt/node_modules/async/lib/async.js:86:13)
    at Array.forEach (native)
    at _forEach (/Users/kaareal/Code/closeterie/node_modules/grunt/node_modules/async/lib/async.js:26:24)
    at Object.async.forEach (/Users/kaareal/Code/closeterie/node_modules/grunt/node_modules/async/lib/async.js:85:9)
    at Object.module.exports (/Users/kaareal/Code/closeterie/lib/grunt/gettext.js:22:11)
    at Object.task.registerMultiTask.thisTask (/Users/kaareal/Code/closeterie/node_modules/grunt/lib/grunt/task.js:258:15)
    at Object.task.registerTask.thisTask.fn (/Users/kaareal/Code/closeterie/node_modules/grunt/lib/grunt/task.js:78:16)
    at Object.Task.start._running (/Users/kaareal/Code/closeterie/node_modules/grunt/lib/util/task.js:282:30)
```