fix(DiskUtil): Fixed NPE crashes trying to get directory size

CHANGELOG.md

@@ -15,12 +15,14 @@
 
 ## Changes
 - Enable 'Split Tall Images' by default (@Smol-Ame)
+- Minor visual adjustments
 
 ## Fixes
 - Fixed only few DoH provider is actually being used (Cloudflare, Google, AdGuard, and Quad9)
 - Fixed "Group by Ungrouped" showing duplicate entries
 - Fixed reader sometimes won't load images
 - Handle some uncaught crashes
+- Fixed potential NPE crashes
 
 ## Other
 - Simplify network helper code

app/src/main/java/eu/kanade/tachiyomi/util/storage/DiskUtil.kt

@@ -20,7 +20,7 @@ object DiskUtil {
     fun getDirectorySize(f: File): Long {
         var size: Long = 0
         if (f.isDirectory) {
-            for (file in f.listFiles()!!) {
+            for (file in f.listFiles().orEmpty()) {
                 size += getDirectorySize(file)
             }
         } else {