returned data tables sometimes don't print output

[sbfnk]

See https://cran.r-project.org/web/packages/data.table/vignettes/datatable-faq.html#why-do-i-have-to-type-dt-sometimes-twice-after-using-to-print-the-result-to-console

Reproducible example:

range_example_wide <- data.table::setDT(scoringutils::range_example_data_wide)
range_example <- scoringutils::range_wide_to_long(range_example_wide)

Typing range_example afterwards does not print the contents of the data frame. Typing it again does.

Solution is to explicitly call DT[] before returning any data.table that has been modified using :=.

[nikosbosse]

closing via #142 and #130. Feel free to reopen if you come across this again. Is there a way to test this automatically?