Chore/remove is object

lib/import-export/import-from-csv.js

@@ -1,5 +1,4 @@
 import csvParser from 'csvtojson'
-import isObject from 'isobject'
 import {
   getSchema,
   tryToImportWithDelete,
@@ -7,6 +6,7 @@ import {
   updateCycleStartsForAllCycleDays,
 } from '../../db'
 import getColumnNamesForCsv from './get-csv-column-names'
+import replaceWithNullIfAllPropertiesAreNull from './replace-with-null'
 import { LocalDate } from '@js-joda/core'
 import labels from '../../i18n/en/settings'
 
@@ -74,17 +74,6 @@ function validateHeaders(headers) {
 
 function putNullForEmptySymptoms(data) {
   data.forEach(replaceWithNullIfAllPropertiesAreNull)
-
-  function replaceWithNullIfAllPropertiesAreNull(obj) {
-    Object.keys(obj).forEach((key) => {
-      if (!isObject(obj[key])) return
-      if (Object.values(obj[key]).every((val) => val === null)) {
-        obj[key] = null
-        return
-      }
-      replaceWithNullIfAllPropertiesAreNull(obj[key])
-    })
-  }
 }
 
 function getDbType(modelProperties, path) {