Removendo string nula ou vazia com FluentIterable

gistfile1.java

private static Iterable<String> filter(Iterable<String> strings) {
	if ( Iterables.isEmpty(strings) ) return null;
	return FluentIterable
		.from( strings )
		.filter( new Predicate<String>() {
			@Override public boolean apply(String value) {
				return !isEmpty( strip(value) );
			}
		});
}