a bug in UserData

[ritow]

org.elasticsearch.plugin.elasticfence.data.UserData.java

public UserData(String userName, String rawPassword, String... filters) {
setUsername(userName);
setPassword(rawPassword);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZZ");
setCreated(sdf.format(new Date()));
if (filters == null) { // TODO , this should be "filters != null"
Set filterSet = Sets.newConcurrentHashSet(Arrays.asList(filters));
setFilters(filterSet);
} else {
Set filterSet = Sets.newConcurrentHashSet();
setFilters(filterSet);
}
}

[lmangani]

Could you extend on your report or submit a PR? Thanks