Don't cache mob infomation in the updater task

Changelog.txt

@@ -1,5 +1,6 @@
 Version 2.1.112
     Correct locale usage for enum access, now enforces using the english locale to prevent issues with oddball locales for configs/commands
+    Don't cache names in mob health updater task, also; Don't schedule if the entity is already dead
 
 Version 2.1.111
     mcMMO is compatible with the following versions of MC: 1.15 / 1.14.4 / 1.14.3 / 1.14.2 / 1.14.1 / 1.14 / 1.13.2

src/main/java/com/gmail/nossr50/runnables/MobHealthDisplayUpdaterTask.java

@@ -6,23 +6,20 @@ import org.bukkit.scheduler.BukkitRunnable;
 
 public class MobHealthDisplayUpdaterTask extends BukkitRunnable {
     private LivingEntity target;
-    private String oldName;
-    private boolean oldNameVisible;
 
     public MobHealthDisplayUpdaterTask(LivingEntity target) {
-        if (target.isValid()) {
-            this.target = target;
-            this.oldName = target.getMetadata(mcMMO.customNameKey).get(0).asString();
-            this.oldNameVisible = target.getMetadata(mcMMO.customVisibleKey).get(0).asBoolean();
-        }
+        this.target = target;
     }
 
     @Override
     public void run() {
-        if (target != null && target.isValid()) {
-            target.setCustomNameVisible(oldNameVisible);
-            target.setCustomName(oldName);
+        if (target.hasMetadata(mcMMO.customNameKey)) {
+            target.setCustomName(target.getMetadata(mcMMO.customNameKey).get(0).asString());
             target.removeMetadata(mcMMO.customNameKey, mcMMO.p);
+        }
+
+        if (target.hasMetadata(mcMMO.customVisibleKey)) {
+            target.setCustomNameVisible(target.getMetadata(mcMMO.customVisibleKey).get(0).asBoolean());
             target.removeMetadata(mcMMO.customVisibleKey, mcMMO.p);
         }
     }

src/main/java/com/gmail/nossr50/util/MobHealthbarUtils.java

@@ -60,6 +60,11 @@ public final class MobHealthbarUtils {
             return;
         }
 
+        // Don't mangle invalid entities, they're not going to be rendered anyways
+        if (!target.isValid()) {
+            return;
+        }
+
         boolean oldNameVisible = target.isCustomNameVisible();
         String newName = createHealthDisplay(Config.getInstance().getMobHealthbarDefault(), target, damage);