don't try to update if there is no SKU

src/match.ts

@@ -1,5 +1,7 @@
 import { Shop } from "./shopifyApi"
 import { Product } from "./Product"
+import { toastAndLog } from "./sheetUtils"
+import { getCellRangeByColumnName } from "./sheetUtils"
 
 export function matchProductToShopify(row: number) {
   console.log("row: " + row)
@@ -18,7 +20,14 @@ export function updateProductToShopify(row: number) {
   console.log(product)
   product.ImportFromInventory(row)
   console.log(product)
-  product.MatchToShopifyProduct(shop)
-  console.log(product)
+  if (product.sku == "") {
+    toastAndLog("No SKU defined for the product on row " + row + "!")
+    let productInventorySheet =
+      SpreadsheetApp.getActiveSpreadsheet().getSheetByName("product_inventory")
+    getCellRangeByColumnName(productInventorySheet, "shopify_id", row).setValue(
+      ""
+    )
+    return
+  }
   product.UpdateShopifyProduct(shop)
 }