[ci skip] minor tweaks

Author: GliczDev

importer-anvil/src/main/java/net/roxymc/slime/importer/anvil/SlimeAnvilImporter.java

@@ -236,7 +236,7 @@ private CompoundBinaryTag readCustomData(CompoundBinaryTag tag, Set<String> tags
         }
     }
 
-    private <T> T[] readRegionFiles(File regionDir, IntFunction<T[]> generator, Function<CompoundBinaryTag, T> function) throws IOException {
+    private <T> T[] readRegionFiles(File regionDir, IntFunction<T[]> generator, Function<CompoundBinaryTag, @Nullable T> function) throws IOException {
         File[] files = regionDir.listFiles((dir, name) -> name.endsWith(MCA));
         if (files == null || files.length == 0) {
             return generator.apply(0);
@@ -252,7 +252,7 @@ private <T> T[] readRegionFiles(File regionDir, IntFunction<T[]> generator, Func
         );
     }
 
-    private <T> T[] readRegionFile(File regionFile, IntFunction<T[]> generator, Function<CompoundBinaryTag, T> function) throws IOException {
+    private <T> T[] readRegionFile(File regionFile, IntFunction<T[]> generator, Function<CompoundBinaryTag, @Nullable T> function) throws IOException {
         byte[] bytes;
         try (FileInputStream is = new FileInputStream(regionFile)) {
             bytes = is.readAllBytes();
@@ -287,7 +287,6 @@ private <T> T[] readRegionFile(File regionFile, IntFunction<T[]> generator, Func
 
             CompoundBinaryTag tag = BinaryTagIO.reader().read(decompressorStream);
             T element = function.apply(tag);
-            //noinspection ConstantValue
             if (element != null) {
                 data.add(element);
             }