Random is not showing anything with just one slide

[raulgc90]

The random option is not showing anything when there is just one image. I 'fixed it' (supposing that there is something wrong and it's not only me :p) by changing this line:

if (opts.random) {

to this one:

if (opts.random && els.length > 1) {

[SeanHayes]

I just found the same bug after upgrading from a really old version. My workaround was to set startingSlide: 0.