no more NullPointerException pls

src/main/java/emu/grasscutter/game/avatar/GenshinAvatar.java

@@ -705,6 +705,7 @@ public class GenshinAvatar {
 				.setExpLevel(10)
 				.setExpNumber(6325); // Highest Level
 		
+		if (this.getFetterList() != null) {
 			for (int i = 0; i < this.getFetterList().size(); i++) {
 				avatarFetter.addFetterList(
 					FetterData.newBuilder()
@@ -712,6 +713,7 @@ public class GenshinAvatar {
 						.setFetterState(FetterState.FINISH.getValue())
 				);
 			}
+		}
 
 		AvatarInfo.Builder avatarInfo = AvatarInfo.newBuilder()
 				.setAvatarId(this.getAvatarId())