init args in flowpreviewcontent

frontend/src/lib/components/FlowBuilder.svelte

@@ -30,10 +30,10 @@
 
 	let previewOpen = false
 
-	let scheduleArgs: Record<string, any>
-	let previewArgs: Record<string, any>
-	let scheduleEnabled: boolean
-	let scheduleCron: string
+	let scheduleArgs: Record<string, any> = {}
+	let previewArgs: Record<string, any> = {}
+	let scheduleEnabled: boolean = false
+	let scheduleCron: string = ''
 
 	$: step = Number($page.url.searchParams.get('step')) || 1
 

frontend/src/lib/components/SchemaForm.svelte

@@ -17,7 +17,7 @@
 	let inputCheck: { [id: string]: boolean } = {}
 	$: isValid = allTrue(inputCheck) ?? false
 
-	$: if (!args) {
+	$: if (args == undefined) {
 		args = {}
 	}