I've smoothed over glass chips by heating the edges using Bunsen burner. It does leave a tiny mark though (more of an imperfection, not really noticable unless you know it's there), and it's kind of tricky (not really tricky, but it requires some skills with melting glass, practice makes perfect).

Another option might be asking one of those "windshield quick fix - while you wait" places if they can repair the chip.

This (post) in (brackets) brought you by too much work on a Monday.

They sell small glass files for smoothing out chips in crystal glassware. My wife has one.

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What a drag it is getting old. -- Stones