добавил ошибку обновления текущих статусов и графика, исправил формат даты и времени на графике

static/js/index-main.js

@@ -76,13 +76,26 @@ async function makeRequest(url) {
 }
 
 async function loadChartData() {
-    let chartTime = localStorage.getItem("settings-chart-time")
-
-    return (await makeRequest('/fetch/tank-chart?days=' + chartTime))['tank_chart']
+    try {
+        const chartTime = localStorage.getItem("settings-chart-time")
+        const res = await makeRequest('/fetch/tank-chart?days=' + chartTime)
+        document.getElementById('chart-update-error').hidden = true
+        return res['tank_chart']
+    } catch (e) {
+        document.getElementById('chart-update-error').hidden = false
+        return undefined
+    }
 }
 
 async function loadLastUpdates() {
-    return (await makeRequest('/fetch/stats'))['stats']
+    try {
+        const res = await makeRequest('/fetch/stats')
+        document.getElementById('stats-update-error').hidden = true
+        return res['stats']
+    } catch (e) {
+        document.getElementById('stats-update-error').hidden = false
+        return undefined
+    }
 }
 
 /**
@@ -352,7 +365,10 @@ const updateFunctions = {
 }
 
 async function updateStatus() {
-    let dataset = await loadLastUpdates()
+    const dataset = await loadLastUpdates()
+    if (dataset === undefined) {
+        return
+    }
 
     for (let id in updateFunctions) {
         let element = document.getElementById(id)