qplot() with empty labels now display as <empty>

[cpsievert]

After the recent change in #4076, qplot()s that don't generate any axis labels now display <empty>, for example:

qplot(1:10)

[yutannihilation]

Thanks, confirmed. Though we are going to deprecate qplot() (#4079), this can be fixed easily by checking if expr$x or expr$y is empty (is_missing()).

ggplot2/R/quick-plot.r

Lines 91 to 96 in 6d91349

	if (is.null(xlab)) {
	xlab <- as_label(exprs$x)
	}
	if (is.null(ylab)) {
	ylab <- as_label(exprs$y)
	}

[thomasp85]

let us fix it still... It is going to remain in perpetuity – @yutannihilation will you provide a PR?

[yutannihilation]

Sure. I might not be able to work on this soon, but I will. Feel free to ping me.