Region class: waitBest hit IndexOutOfBoundsException

[thinhdnn]

My cases:

1. Bigger image is the first, and the second is the matching image. This will throw an exception.
2. The first is the matching image, and the second is a bigger image. This will show the first image matched.

Because here. results.add((Integer) current[0], (Long) current[1]); get exception Index of outbound for case 1
Cannot add index 1 to empty list.

for (Future result : fResults) {
try {
Object[] current = (Object[]) result.get();
maxDuration = Math.max((Long) current[1], maxDuration);
results.add((Integer) current[0], (Long) current[1]);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}