Don't show downloads graph for directories

svelte/src/filesystem/DetailsWindow.svelte

@@ -6,13 +6,14 @@ import { fs_timeseries } from "./FilesystemAPI";
 import { fs_path_url } from "./FilesystemUtil";
 import { generate_share_url } from "./Sharebar.svelte";
 import { color_by_name } from "../util/Util.svelte";
+import { tick } from "svelte";
 
 export let state
 export let visible = false
 export const toggle = () => visible = !visible
 
 $: visibility_change(visible)
-const visibility_change = (visible) => {
+const visibility_change = visible => {
 	if (visible) {
 		update_chart(state.base, 0, 0)
 	}
@@ -40,7 +41,12 @@ let total_bandwidth_paid = 0
 
 $: update_chart(state.base, chart_timespan, chart_interval)
 let update_chart = async (base, timespan, interval) => {
-	if (!visible) {
+	if (chart === undefined) {
+		// Wait for the chart element to render, if it's not rendered already
+		await tick()
+	}
+
+	if (!visible || base.type !== "file" || chart === undefined) {
 		return
 	}
 
@@ -170,6 +176,7 @@ let update_chart = async (base, timespan, interval) => {
 		{/if}
 	</table>
 
+	{#if state.base.type === "file"}
 		<h3 class="indent">Download statistics</h3>
 
 		<div class="button_bar">
@@ -183,6 +190,7 @@ let update_chart = async (base, timespan, interval) => {
 		</div>
 
 		<Chart bind:this={chart} />
+	{/if}
 </Modal>
 
 <style>