stacks.js: Ensure arrays are treated as such in zone-file dependency to prevent file parsing errors

I’m encountering the following error thrown by the zone-file dependency upon passing a username (“markmhendrickson.id” in my case) into getFile (see my invocation code here):

TypeError: Cannot read property 'length' of undefined
    at flatten (parseZoneFile.js:33)
    at parseZoneFile (parseZoneFile.js:9)
    at profileZoneFiles.js:76
    at new Promise (<anonymous>)
    at resolveZoneFileToProfile (profileZoneFiles.js:73)
    at profileLookup.js:38

The flatten method in that package (https://github.com/blockstack/zone-file-js/blob/master/src/parseZoneFile.es6#L16) seems to think that regex matches have been found in the text variable (which represents my zonefile correctly). So it enters the for-loop on line 31 before trying to get the length of match[0] which is undefined since captured is actually an empty array.

Note that when I omit the “username” parameter from the “getFile” method, I don’t encounter this error.

I can’t figure out what’s going on here. I thought maybe this was the result of not applying “publish_data” as a scope during authentication, but the same error persists even after adding it and re-authenticating with the same ID.

This can also be tested for recreation by going through the authentication flow on https://humans.name/ and viewing the console upon callback.

@kantai any ideas given your familiarity with the zone-file package?