Fix: OXUIB-1289 - UI-Middleware breaks if UI-Containers are not available

Root cause: If some of the UI containers is not available after successful start, the version update check might fail.
Solution: Add error handlers when manifests can not be fetched after startup

src/createApp.js

@@ -41,6 +41,8 @@ export function createApp () {
     const stopTimer = startUpTimeGauge.startTimer()
     try {
       const viteManifests = await loadViteManifests()
+      // also need to load ox manifests here, to make sure the cache is warm
+      await getOxManifests()
       const deps = viteManifestToDeps(viteManifests)
       await fileCache.warmUp(viteManifests, deps)
     } catch (e) {

src/manifests.js

@@ -96,8 +96,8 @@ export const getOxManifests = (() => {
   let prevHash
   let oxManifestCache
   return async function getOxManifests () {
-    const viteManifest = await loadViteManifests()
-    if (viteManifest.__hash__ !== prevHash) {
+    const viteManifest = await loadViteManifests().catch(() => {})
+    if (viteManifest && viteManifest.__hash__ !== prevHash) {
       oxManifestCache = viteToOxManifest(viteManifest)
       prevHash = viteManifest.__hash__
     }
@@ -124,8 +124,9 @@ export const getDependencies = (() => {
   let prevHash
   let depCache
   return async function getDependencies () {
-    const viteManifest = await loadViteManifests()
-    if (viteManifest.__hash__ !== prevHash) {
+    // simply catch the error here. This might happen, when one of the UI containers is temporarily not available
+    const viteManifest = await loadViteManifests().catch(() => {})
+    if (viteManifest && viteManifest.__hash__ !== prevHash) {
       depCache = viteManifestToDeps(viteManifest)
       prevHash = viteManifest.__hash__
     }
@@ -143,8 +144,8 @@ export const getVersion = (() => {
   let prevHash
   let versionString
   return async function getVersion () {
-    const viteManifest = await loadViteManifests()
-    if (viteManifest.__hash__ !== prevHash) {
+    const viteManifest = await loadViteManifests().catch(() => {})
+    if (viteManifest && viteManifest.__hash__ !== prevHash) {
       versionString = `${+new Date()}.${viteManifest.__hash__}`
       prevHash = viteManifest.__hash__
     }