change is.na to check each element in chunk with isNA (instead of at0ing the element)
change is.na to check each element in chunk with isNA (instead of at0ing the element)

vbelakov/h2o,h2oai/h2o,vbelakov/h2o,calvingit21/h2o-2,vbelakov/h2o,h2oai/h2o,calvingit21/h2o-2,h2oai/h2o,elkingtonmcb/h2o-2,100star/h2o,111t8e/h2o-2,100star/h2o,rowhit/h2o-2,100star/h2o,h2oai/h2o,111t8e/h2o-2,111t8e/h2o-2,vbelakov/h2o,rowhit/h2o-2,vbelakov/h2o,eg-zhang/h2o-2,111t8e/h2o-2,h2oai/h2o,h2oai/h2o-2,h2oai/h2o,elkingtonmcb/h2o-2,111t8e/h2o-2,elkingtonmcb/h2o-2,h2oai/h2o-2,elkingtonmcb/h2o-2,111t8e/h2o-2,h2oai/h2o,111t8e/h2o-2,calvingit21/h2o-2,calvingit21/h2o-2,eg-zhang/h2o-2,rowhit/h2o-2,vbelakov/h2o,eg-zhang/h2o-2,rowhit/h2o-2,h2oai/h2o-2,h2oai/h2o-2,eg-zhang/h2o-2,vbelakov/h2o,vbelakov/h2o,rowhit/h2o-2,eg-zhang/h2o-2,rowhit/h2o-2,elkingtonmcb/h2o-2,elkingtonmcb/h2o-2,111t8e/h2o-2,eg-zhang/h2o-2,100star/h2o,111t8e/h2o-2,elkingtonmcb/h2o-2,100star/h2o,h2oai/h2o-2,h2oai/h2o,rowhit/h2o-2,calvingit21/h2o-2,elkingtonmcb/h2o-2,h2oai/h2o-2,100star/h2o,h2oai/h2o-2,h2oai/h2o-2,elkingtonmcb/h2o-2,100star/h2o,calvingit21/h2o-2,100star/h2o,100star/h2o,h2oai/h2o,eg-zhang/h2o-2,calvingit21/h2o-2,calvingit21/h2o-2,calvingit21/h2o-2,vbelakov/h2o,h2oai/h2o,h2oai/h2o-2,elkingtonmcb/h2o-2,vbelakov/h2o,rowhit/h2o-2,rowhit/h2o-2,111t8e/h2o-2,eg-zhang/h2o-2,rowhit/h2o-2,h2oai/h2o-2,eg-zhang/h2o-2,eg-zhang/h2o-2,calvingit21/h2o-2