Using non-existent key on Flip at method throws ArrayIndexOutOfBoundsException

[sshanks-kx]

Using a non-existent key on a Flip throws a java.lang.ArrayIndexOutOfBoundsException. Should prob document in code (so that users expect it) or change.

        String[] x = new String[] {"Key"};
        String[][] y = new String[][] {{"Value1","Value2","Value3"}};
        c.Dict dict = new c.Dict(x, y);
        c.Flip flip = new c.Flip(dict);
        flip.at("NOT FOUND");