Bug fix in blacklist: error when custom blacklist is empty
toggle blacklisting / whitelisting on extension toggle
Merge branch 'lists-categories' of https://github.com/gcornu/web-browser-for-children into activate_-_deactivate_child_browsing
Fix bug in whitelist when custom whitelist is empty
Merge branch 'lists-categories' of https://github.com/gcornu/web-browser-for-children into activate_-_deactivate_child_browsing