LMS-1947 More tests.

...rver/entityregistration/test-data/empty-lines/control.tsv

...r/entityregistration/test-data/empty-lines/ds1/.gitignore

...r/entityregistration/test-data/empty-lines/ds2/.gitignore

...r/entityregistration/test-data/empty-lines/ds3/.gitignore

...istration/test-data/missing-sample-identifier/control.tsv

...ration/test-data/missing-sample-identifier/ds1/.gitignore

...ration/test-data/missing-sample-identifier/ds2/.gitignore

...ration/test-data/missing-sample-identifier/ds3/.gitignore

...ration/test-data/not-all-subfolders-mentioned/control.tsv

...ion/test-data/not-all-subfolders-mentioned/ds1/.gitignore

...ion/test-data/not-all-subfolders-mentioned/ds2/.gitignore

...ion/test-data/not-all-subfolders-mentioned/ds3/.gitignore