Version 2.2.2

Fixes

• Fixed a bug in the built-in FileSystemLoader where a ValueError would be raised at render time if the target file name is empty or, in some cases, contains only path punctuation and the loader is configured with a default file extension. Now a TemplateNotFoundError is raised instead. See #203.
• Fixed an issue with the built-in FileSystemLoader where a ValueError would be raised at render time if the configured default file extension is not a valid suffix. Now we raise a ValueError at FileSystemLoader construction time if the ext argument is not a valid suffix.
• Fixed a bug with the {% cycle %} tag. Previously, if given a cycle group name without any other arguments, a ZeroDivisionError exception would be raised at render time. Now we raise a LiquidSyntaxError (we don't have a TagArgumentError) at parse time. See #202.
• Fixed a bug where we'd get an AssertionError at render time when resolving variables using bracket syntax for the root segment and that segment evaluates to a non-string value. Now such uses of bracketed path syntax will be resolved to the configured Undefined type. See #206.