hdr_value_at_percentile says 95th percentile of empty histogram is 63

[lukeocamden]

Steps to repro:

hdr_histogram* histogram;
hdr_init(100, 10 * 1000 * 1000, 3, &histogram);
std::cout << hdr_value_at_percentile(histogram, 95) << std::endl;

Is there a more intuitive value that could be returned here eg zero?

[mikeb01]

I have noticed some weird behaviour with empty histograms. I'll need to check with the behaviour of the Java implementation.