Fixed potential index out of range error in Java client.

Java/src/XPlaneConnect.java

@@ -466,8 +466,15 @@ public class XPlaneConnect implements AutoCloseable
         for(i = 0; i < 6; ++i)
         {
             if(i == 4)
+            {
+                if(i >= values.length)
+                {
+                    bb.put(cur, (byte)-1);
+                }
+                else
                 {
                     bb.put(cur, (byte)values[i]);
+                }
                 cur += 1;
             }
             else if (i >= values.length)