Update serialization methods to handle null objects

Modified the `serialize` method in multiple classes to accept `@Nullable` objects. Added a check for null objects returning `Tag.EMPTY` when null to prevent potential null pointer exceptions. Updated the version in `build.gradle.kts` to 2.2.7 to reflect the changes.

nbt/build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 }
 
 group = "net.thenextlvl.core"
-version = "2.2.6"
+version = "2.2.7"
 
 java {
     toolchain.languageVersion = JavaLanguageVersion.of(21)

nbt/src/main/java/core/nbt/serialization/NBT.java

@@ -62,7 +62,7 @@ public <T> T fromTag(@NonNull Tag tag, @NonNull Type type) {
      * @param object the object to be serialized
      * @return the Tag representation of the provided object
      */
-    public @NonNull Tag toTag(@NonNull Object object) {
+    public @NonNull Tag toTag(@Nullable Object object) {
         return serializer.serialize(object);
     }
 

nbt/src/main/java/core/nbt/serialization/Serializer.java

@@ -29,7 +29,8 @@ class Serializer implements TagDeserializationContext, TagSerializationContext {
     }
 
     @Override
-    public Tag serialize(Object object) {
+    public Tag serialize(@Nullable Object object) {
+        if (object == null) return Tag.EMPTY;
         return serialize(object, object.getClass());
     }
 

nbt/src/main/java/core/nbt/serialization/TagSerializationContext.java

@@ -17,7 +17,7 @@ public interface TagSerializationContext {
      * @return the serialized Tag representation of the object
      */
     @NonNull
-    Tag serialize(@NonNull Object object);
+    Tag serialize(@Nullable Object object);
 
     /**
      * Serializes the given object into a Tag representation based on the specified type.