This could theoretically happen if a post is loaded in some other context
(without its likes relationship) and overwrites the full version in the
store. While this should ideally never happen, it's better to fail
gracefully if it does.
Fixesflarum/core#1665
Since we don't return an "unread count" in the API, this pluralization
logic is useless at the moment. Related to #643 and #716 but really
needs further thought in #868.
See https://github.com/flarum/core/pull/1367
* Replace gulp with webpack and npm scripts for JS compilation
* Set up Travis CI to commit compiled JS
* Restructure `js` directory; only one instance of npm, forum/admin are "submodules"
* Restructure `less` directory
