[Rd] Data frame printing buglet when multiple empty column names

[Hadley Wickham]

This is admittedly minor, and you shouldn't have repeated names in a
data frame anyway, but:

df <- data.frame(1:3, 1:3, 1:3)

# Ok
setNames(df, c("x", "y", ""))

# Not ok
setNames(df, c("x", "", ""))

Hadley

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