check prepack size for 0 bytes about t1-cli HOT 4 OPEN

@jiahuang I'm not sure what the benefit is here. If you push up a 0 byte file, what should be happening instead?

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we should be telling people that they're not actually pushing any code to tessel

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Does involve pushing a file 0 bytes long though? Node nor any other runtime environment would do otherwise here.

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We shouldn't create a special exception to alert users of code that is a no-op (since files with content in them can also be no-ops, creating the same confusion).

If the "~4kb" file size is misleading, we might consider changing this to "0kb files compressed", indicating script has come to a completion, or other UX alternatives.

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