Fix new avatar weapons being null

src/main/java/emu/grasscutter/utils/Utils.java

@@ -1,15 +1,16 @@
 package emu.grasscutter.utils;
 
-import static emu.grasscutter.utils.FileUtils.getResourcePath;
-import static emu.grasscutter.utils.lang.Language.translate;
-
 import emu.grasscutter.Grasscutter;
 import emu.grasscutter.config.ConfigContainer;
 import emu.grasscutter.data.DataLoader;
 import emu.grasscutter.game.world.Position;
+import emu.grasscutter.utils.objects.Returnable;
 import io.javalin.http.Context;
 import io.netty.buffer.*;
 import it.unimi.dsi.fastutil.ints.*;
+import org.slf4j.Logger;
+
+import javax.annotation.Nullable;
 import java.io.*;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.*;
@@ -17,8 +18,9 @@ import java.time.*;
 import java.time.temporal.TemporalAdjusters;
 import java.util.*;
 import java.util.concurrent.ThreadLocalRandom;
-import javax.annotation.Nullable;
-import org.slf4j.Logger;
+
+import static emu.grasscutter.utils.FileUtils.getResourcePath;
+import static emu.grasscutter.utils.lang.Language.translate;
 
 @SuppressWarnings({"UnusedReturnValue", "BooleanMethodIsAlwaysInverted"})
 public final class Utils {
@@ -477,4 +479,20 @@ public final class Utils {
         // Return the request IP.
         return ctx.ip();
     }
+
+    /**
+     * Waits for the task to return true.
+     * This will halt the thread until the task returns true.
+     *
+     * @param runnable The task to run.
+     */
+    public static void waitFor(Returnable<Boolean> runnable) {
+        while (!runnable.invoke()) {
+            try {
+                Thread.sleep(100);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
 }