Fix crash after last screensaver image in list (#1055)

## Description
Fix a screensaver crash after the last item

Also adds some extra error checking

### Related issues
Fixes #1053

### Testing
Emulator

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/services/AppUpgradeHandler.kt

@@ -250,7 +250,7 @@ suspend fun upgradeApp(
         }
     }
 
-    if (previous.isEqualOrBefore(Version.fromString("0.5.0-6-g0"))) {
+    if (previous.isEqualOrBefore(Version.fromString("0.5.3-0-g0"))) {
         appPreferences.updateData {
             it.updateScreensaverPreferences {
                 startDelay = ScreensaverPreference.DEFAULT_START_DELAY

app/src/main/java/com/github/damontecres/wholphin/services/ScreensaverService.kt

@@ -161,7 +161,13 @@ class ScreensaverService
                 if (pager.isEmpty()) {
                     emit(null)
                 } else {
+                    val duration =
+                        userPreferencesService
+                            .getCurrent()
+                            .appPreferences
+                            .interfacePreferences.screensaverPreference.duration.milliseconds
                     while (true) {
+                        try {
                             val item = pager.getBlocking(index)
                             Timber.v("Next index=%s, item=%s", index, item?.id)
                             if (item != null) {
@@ -181,7 +187,6 @@ class ScreensaverService
                                     }
                                 val logoUrl = imageUrlService.getItemImageUrl(item, ImageType.LOGO)
                                 if (backdropUrl != null) {
-                                try {
                                     context.imageLoader
                                         .enqueue(
                                             ImageRequest
@@ -191,18 +196,17 @@ class ScreensaverService
                                         ).job
                                         .await()
                                     emit(CurrentItem(item, backdropUrl, logoUrl, title ?: ""))
-                                } catch (_: CancellationException) {
-                                    break
-                                }
-                                val duration =
-                                    userPreferencesService
-                                        .getCurrent()
-                                        .appPreferences
-                                        .interfacePreferences.screensaverPreference.duration.milliseconds
                                     delay(duration)
                                 }
                             }
+                        } catch (_: CancellationException) {
+                            break
+                        } catch (ex: Exception) {
+                            Timber.e(ex, "Error fetching next item")
+                            delay(duration)
+                        }
                         index++
+                        if (index > pager.lastIndex) index = 0
                     }
                 }
             }.flowOn(Dispatchers.Default).cancellable()