Fix handler of unknown axiom channels

src/main/java/com/moulberry/axiom/buffer/MojBuf.java

@@ -17,7 +17,7 @@ public class MojBuf {
     private MojBuf() {}
 
     public static ByteBuf unpooled() {
-        return new FriendlyByteBuf(Unpooled.buffer(256, Integer.MAX_VALUE));
+        return new FriendlyByteBuf(Unpooled.buffer());
     }
 
     private static final Reflection.Method<FriendlyByteBuf, String> readUtf = Reflection.getTypedMethod(FriendlyByteBuf.class, String.class, int.class);

src/main/java/com/moulberry/axiom/packet/AxiomBigPayloadHandler.java

@@ -93,7 +93,9 @@ public class AxiomBigPayloadHandler extends ChannelInboundHandlerAdapter {
         }
 
         for(QueuedPacket packet : queue) {
-            AxiomPaper.getListener(packet.name).onMessage(player, packet.in);
+            AxiomPacketListener handler = AxiomPaper.getListener(packet.name);
+            if(handler != null)
+                handler.onMessage(player, packet.in);
             packet.in.release();
         }
     }