protect against no active themes

[topepo]

ggdark::dark_theme_grey()
#> Error in if (geoms_are_dark || force_geom_invert) {: missing value where TRUE/FALSE needed

^{Created on 2024-06-29 with reprex v2.1.0}

or maybe add ggplot2 as depends since it doesn't work without it loaded

[joergsesterhenn]

I get this error when using ggdark in a shinyApp that renders ggplot2 plots.

missing value where TRUE/FALSE needed

I just added the darktheme to the plots like shown in the examples.

I had to add

library(ggplot2)

to get this to work.

Before using ggdark I did not need this since I used ggplot2::... whenever I called a plot-function.