hadley/ggplot2 — Issue #386: guide_legend(title=NULL) sets title to "NULL"
Author: wch
Created: 2012-02-05 18:25:16+00:00
State: open

Example:

```R
dat <- data.frame(x=LETTERS[1:3], y=1)

ggplot(dat, aes(x=x, y=y, fill=x)) + geom_bar() +
scale_fill_hue(guide_legend(title=NULL))
```

According to the help page:

```
title: A character string or expression indicating a title of guide.
If ‘NULL’, the title is not shown.
```