Add-on directory clean-up error after update check

It seems we get an error after the add-on update check with ESR45:

1461145678000	addons.xpi	ERROR	Failed to clean updated system add-ons directories.: Unix error 2 during operation DirectoryIterator.prototype.next on file /path/to/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/features (file or directory not found) ((unknown module)) No traceback available

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