Empty file should print a warning.

[eth-p]

Another UX issue, but I think an empty (0 byte) file should print a warning or indicator of some sorts (similarly to bat). A blank grid might be confusing when someone is under the impression that they're inspecting a non-empty file.

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Note: I'm doing a class assignment regarding creating tests (from scratch) for an open-source command line program, and I chose hexyl for it. You might have a couple more of these on the way, depending on what the assignment brings to light :)

[sharkdp]

Sounds good!