Solved How to check atLeast in a .yml file?

Hey guys,

Im stuck with a very hard thing. At least, for me it is hard

But, im gonne tell you.
I have a .yml file. With some Objects, and some other locations and a stringList. I'm trying to loop trough the stringList and check if all the String's in the StringList is null. So, if atLeast 1 location in the config, return true. If all the String's in the conifg, doenst have a location. Return null.
I dont know how i must do it, i have figure it out for like 3 days, and without result. I hope you guys can help me out

This, is my code now:

Code:

    @SuppressWarnings("unchecked")
    public String chooseRandomArena() {   
        //System.out.print(checkAllArenasIfitHasASpawn());
        ArrayList<String> list = (ArrayList<String>) Main.newConfigz.getList("totalArenas");
        for (int i = 0; i < list.size(); i ++) {
            System.out.print(list.size());
            if (Main.newConfigz.contains("arenas." + list.get(i) + ".first")) {
                System.out.print("arenas." + list.get(i) + ".first");
        if (list.isEmpty()) {
            return null;
        }
            Random r = new Random();
            int s = r.nextInt(list.size());
            //System.out.print(list.get(s));
            if (!Arena.isStarted(list.get(s))&&isArenaLocationSet(1,list.get(s))&&isArenaLocationSet(1, list.get(s))&&isArenaLocationSet(2, list.get(s))&&isArenaLocationSet(3, list.get(s))) {
                String a = list.get(s);
                //System.out.print(list.get(s));
                return a;
            }else {
                //System.out.print(a);
                chooseRandomArena();
            }         
        }
        }
        return null;
    }

The problem is, when it gets a String, it returns null, because the StringLocation is null. That is right, but there is another String in the config thats not null. So, how do i check, if atLeast 1 or more in the config has a location?

Btw, this is my config, for the people that wanted it

Saves.YML (open) Saves.YML (close)

Code:

arenas:
  jusjus:
    maxPlayers: 2
    isStarted: false
    first:
      World: world
      X: -259.37252752185555
      Y: 70.0
      Z: 313.2091373014552
      Pitch: 8.083455
      Yaw: 2.7444556
    second:
      World: world
      X: -259.28686895126776
      Y: 70.0
      Z: 340.67001821899845
      Pitch: 22.933455
      Yaw: 177.79448
    end:
      World: world
      X: -296.039831207993
      Y: 69.0
      Z: 324.4038723316471
      Pitch: 8.383454
      Yaw: 288.04443
  test:
    maxPlayers: 2
    isStarted: false
totalArenas:
- jusjus
- test