#3 Add example where all are filtered during standardisation

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HenryCrosswell merged 3 commits from neuroinformatics/km/frontend-tests into neuroinformatics/master 3 veckor sedan

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Upphovsman SHA1 Meddelande Datum
  Kimberly Meechan 1a2b747e96 add offspring sex column 3 veckor sedan
  Kimberly Meechan c65420a9cf Merge branch 'master' of https://gin.swc.ucl.ac.uk/neuroinformatics/oscar-test-data into km/frontend-tests 3 veckor sedan
  Kimberly Meechan f0abadd779 add csv file where all rows are forbidden 3 veckor sedan