Don't try to duplicate nil options

[davidcornu]

In the case when options is omitted, calling .dup on it results in TypeError: can't dup NilClass.

[arthurnn]

need to add a regression test for it.

Also, I would do something like this, instead of changing the default value of the argument, just so we dont create extra objects.

options && options.dup || {}

[davidcornu]

@arthurnn updated.

[carlosantoniodasilva]

Thanks.