ExportConfiguration$savePlot() fails with defaults

[PavelBal]

Especiall the format field, which is by default NULL, should be initalized with something meaningful.

[PavelBal]

it seems that format is completely ignored, and output device is determined by the file name??

> exportConfig$savePlot(gridPlot, fileName = "All plots")
Error in `plot_dev()`:
! Unknown graphics device ''
Backtrace:
 1. exportConfig$savePlot(gridPlot, fileName = "All plots")
 2. ggplot2::ggsave(...)
      at TLF-Library/R/plotconfiguration-export.R:84:6
 3. ggplot2:::plot_dev(device, filename, dpi = dpi)

Using .png extension in file name works:

> exportConfig$savePlot(gridPlot, fileName = "All plots.png")
> 

I think file name must not come with the extension.