Fixed errors in argument retrieval. Added check to ensure masked samples are initially in the merged dataset.
Fixed errors in argument retrieval. Added check to ensure masked samples are initially in the merged dataset.

Signed-off-by: Julian de Ruiter <106ec1c3769f726213d2e7001d0e2990a7854626@gmail.com>

jrderuiter/pyim,jrderuiter/pyim