Animation returns an empty trailing Frame

[lukasjapan]

A trailing frame with no points is returned by the Animation parser.

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https://github.com/echelon/ilda.rs/blob/master/src/animation.rs#L116

The ILDA specification defines an empty header at the end of the file which is transformed into a Frame by the above implementation.

IMO this header should behave like an EOF marker and should be discarded. Introducing an additional frame might lead to unwanted side effects.

[echelon]

Thanks for filing this! I've been needing some proper code review.

I'll get to this shortly.