fix(medusa): Product import - allow null product type (#2424)

**What**
- allow the product type field to be null

**How**
- in case the type is `null`, pass `undefined` as the value of type prop to product create/update services, otherwise pass an object with `{value}` which will be upserted

Co-authored-by: Oliver Windall Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/medusa/src/strategies/batch-jobs/product/import.ts

@@ -761,7 +761,23 @@ const CSVSchema: ProductImportCsvSchema = {
     { name: "Product Collection Title", mapTo: "product.collection.title" },
     { name: "Product Collection Handle", mapTo: "product.collection.handle" },
     // PRODUCT-TYPE
-    { name: "Product Type", mapTo: "product.type.value" },
+    {
+      name: "Product Type",
+      match: /Product Type/,
+      reducer: (
+        builtLine: TParsedProductImportRowData,
+        key,
+        value
+      ): TBuiltProductImportLine => {
+        if (typeof value === "undefined" || value === null) {
+          builtLine["product.type"] = undefined
+        } else {
+          builtLine["product.type.value"] = value
+        }
+
+        return builtLine
+      },
+    },
     // PRODUCT-TAGS
     {
       name: "Product Tags",

packages/medusa/src/strategies/batch-jobs/product/types.ts

@@ -42,7 +42,7 @@ export type InjectedProps = {
  */
 export type TParsedProductImportRowData = Record<
   string,
-  string | number | object | (string | number | object)[]
+  string | number | object | undefined | (string | number | object)[]
 >
 
 /**