Chore/remove is object

lib/import-export/replace-with-null.js

@@ -0,0 +1,12 @@
+const isObject = (obj) => obj === Object(obj)
+
+export default 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])
+  })
+}