handle undefined modules

frontend/src/lib/components/flows/map/FlowModuleSchemaMap.svelte

@@ -21,7 +21,7 @@
 	import { slide } from 'svelte/transition'
 
 	export let root: boolean = false
-	export let modules: FlowModule[]
+	export let modules: FlowModule[] | undefined
 
 	let indexToRemove: number | undefined = undefined
 	const { select } = getContext<FlowEditorContext>('FlowEditorContext')
@@ -41,6 +41,7 @@
 				;[module, state] = await createBranchAll(module.id)
 			}
 			const flowModule = module
+			if (!modules) return
 			modules.splice(index, 0, flowModule)
 			modules = modules
 			$flowStateStore[flowModule.id] = state
@@ -50,6 +51,7 @@
 
 	function removeAtIndex(index: number): void {
 		select('settings')
+		if (!modules) return
 		const [removedModule] = modules.splice(index, 1)
 		modules = modules
 
@@ -107,25 +109,27 @@
 			</li>
 		{/if}
 
-		{#each modules as mod, index (mod.id ?? index)}
-			<div transition:slide|local>
-				<MapItem
-					bind:mod
-					on:delete={(event) => {
-						if (event.detail.detail.shiftKey || mod.value.type === 'identity') {
-							removeAtIndex(index)
-						} else {
-							indexToRemove = index
-						}
-					}}
-					on:insert={(e) => {
-						insertNewModuleAtIndex(index, e.detail)
-					}}
-				/>
-			</div>
-		{/each}
+		{#if modules}
+			{#each modules as mod, index (mod.id ?? index)}
+				<div transition:slide|local>
+					<MapItem
+						bind:mod
+						on:delete={(event) => {
+							if (event.detail.detail.shiftKey || mod.value.type === 'identity') {
+								removeAtIndex(index)
+							} else {
+								indexToRemove = index
+							}
+						}}
+						on:insert={(e) => {
+							insertNewModuleAtIndex(index, e.detail)
+						}}
+					/>
+				</div>
+			{/each}
+		{/if}
 
-		<InsertModuleButton on:new={(e) => insertNewModuleAtIndex(modules.length, e.detail)} />
+		<InsertModuleButton on:new={(e) => insertNewModuleAtIndex(modules?.length ?? 0, e.detail)} />
 	</ul>
 	{#if root}
 		<div class="sticky bottom-0 bg-gray-50 flex-none px-4 py-1 pb-2 border-t">