Avoid crashing if invalid download and backup location is set

Fixes #8252

app/src/main/java/eu/kanade/presentation/more/settings/screen/AboutScreen.kt

@@ -205,7 +205,7 @@ class AboutScreen : Screen {
                 BuildConfig.DEBUG -> {
                     "Debug ${BuildConfig.COMMIT_SHA}".let {
                         if (withBuildDate) {
-                            "$it (${getFormattedBuildTime()}"
+                            "$it (${getFormattedBuildTime()})"
                         } else {
                             it
                         }

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsBackupScreen.kt

@@ -380,8 +380,10 @@ class SettingsBackupScreen : SearchableSettings {
                 Preference.PreferenceItem.TextPreference(
                     title = stringResource(R.string.pref_backup_directory),
                     subtitle = remember(backupDir) {
-                        UniFile.fromUri(context, backupDir.toUri()).filePath!! + "/automatic"
-                    },
+                        (UniFile.fromUri(context, backupDir.toUri())?.filePath)?.let {
+                            "$it/automatic"
+                        }
+                    } ?: stringResource(R.string.invalid_location, backupDir),
                     onClick = {
                         try {
                             pickBackupLocation.launch(null)

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsDownloadScreen.kt

@@ -102,8 +102,8 @@ class SettingsDownloadScreen : SearchableSettings {
             pref = currentDirPref,
             title = stringResource(R.string.pref_download_directory),
             subtitle = remember(currentDir) {
-                UniFile.fromUri(context, currentDir.toUri()).filePath!!
-            },
+                UniFile.fromUri(context, currentDir.toUri())?.filePath
+            } ?: stringResource(R.string.invalid_location, currentDir),
             entries = mapOf(
                 defaultDirPair,
                 customDirEntryKey to stringResource(R.string.custom_dir),

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadProvider.kt

@@ -57,7 +57,7 @@ class DownloadProvider(private val context: Context) {
                 .createDirectory(getMangaDirName(mangaTitle))
         } catch (e: Throwable) {
             logcat(LogPriority.ERROR, e) { "Invalid download directory" }
-            throw Exception(context.getString(R.string.invalid_download_dir))
+            throw Exception(context.getString(R.string.invalid_location, downloadsDir))
         }
     }