Blank label error

[fmarotta]

Hi! geom_marquee() errors out when the label is empty or contains only blank characters. The error message is not too informative, either. In comparison, geom_text() and geom_label() do not complain and print the label even if it's blank.

library(ggplot2)
library(marquee)
ggplot(data.frame(x = 0, y = 0, label = "")) +
  geom_marquee(aes(x, y, label = label))
#> Error in `geom_marquee()`:
#> ! Problem while converting geom to grob.
#> ℹ Error occurred in the 1st layer.
#> Caused by error in `if (nrow(x$shape) > 0) ...`:
#> ! argument is of length zero

^{Created on 2024-12-30 with reprex v2.1.1}