Create report rule fails for test data

While testing the pipeline with Singularity support (branch) I utilized this test routine and run into an issue while generating the final report in R:

Quitting from lines 539-549 (ncov_minipipe.Rmd) 
Error in seq.default(min, max, by = by) : 'from' must be a finite number
Calls: <Anonymous> ... <Anonymous> -> f -> <Anonymous> -> seq -> seq.default

The error belongs to

ggplot(dt.coverage, aes(position, depth)) +
    geom_point(size = 0.1, colour = "#4444DD") +
    labs(title = "coverage distribution") +
    theme(plot.title = element_text(hjust = 0.5), 
          axis.text.x = element_text(angle = 45, hjust = 0.5),
          legend.position = "none") +
    scale_y_continuous(trans = "log10") +
    facet_wrap(~sample, ncol = 3, scales = "free_y")

in particular

scale_y_continuous(trans = "log10") +

that I can comment and then the script runs through.

I think this is due to the small example input resulting in too few values for log transformation.

I will try to directly fix this in the Singularity branch.