fix: coerce single-column extraction of data.frame to vector to avoid bug using tibble data.frame

Refs #49
1 job for 49-fix-prepgr-when-the-dataset-is-format-as-a-tibble-object in 1 minute and 31 seconds (queued for 8 seconds)
Status Name Job ID Coverage
  Check
passed check_as_cran_patched #206720

00:01:31