Adding subreddits to exclude does not work on chrome 49.0.2623.87

[sirotnikov]

Manually adding a subreddit throws:

options.js:864 Uncaught TypeError: Cannot set property 'disabled' of undefined(anonymous function) @ options.js:864

which is this line: this.addToExcludeButton.disabled = true;

This does not save and upon further reloading of the option pages I get :

extensions::uncaught_exception_handler:8 Error in response to storage.get: TypeError: this.addSubredditExclusionItem is not a function at chrome-extension://opgodjgjgojjkhlmmhdlojfehcemknnp/res/options.js:749:30 at Options. (chrome-extension://opgodjgjgojjkhlmmhdlojfehcemknnp/res/options.js:748:45) at Object.callback (chrome-extension://opgodjgjgojjkhlmmhdlojfehcemknnp/res/options.js:295:29) at Function.Preferences.initialise (chrome-extension://opgodjgjgojjkhlmmhdlojfehcemknnp/res/options.js:292:41) at Options. (chrome-extension://opgodjgjgojjkhlmmhdlojfehcemknnp/res/options.js:689:39)

But the subreddit does not appear in the list, and is not filtered effectively.