Fix crash in KeyValueBuilder when object doesn't exist

packages/builder/src/components/integration/KeyValueBuilder.svelte

@@ -31,7 +31,10 @@
   export let menuItems
   export let showMenu = false
 
-  let fields = Object.entries(object).map(([name, value]) => ({ name, value }))
+  let fields = Object.entries(object || {}).map(([name, value]) => ({
+    name,
+    value,
+  }))
   let fieldActivity = buildFieldActivity(activity)
 
   $: object = fields.reduce(