layer.r: added missing error message newline/spacer

[setempler]

Problem: 'stop' does not separate elements in the dots argument, therefore the error message (R/layer.r line 160f) is clumped:
Reproducible example:

f <- function (a) ggplot(data.frame(x=rnorm(10),y=1:10), aes_q(x=quote(x),y=quote(y),color=a)) + geom_point()
f(1) # runs fine
f(1:3) # returns the error message:
Error: Aesthetics must either be length one, or the same length as the dataProblems:1:3

The fix would result in
...
f(1:3)
Error: Aesthetics must either be length one, or the same length as the data
Problems: 1:3

[hadley]

Maybe also a full stop after data?

[setempler]

in progress

[hadley]

Thanks!

[lock]

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