[fix] Return empty array when passed `undefined` or `null` in amazon.Client.prototype._toArray
[fix] Return empty array when passed `undefined` or `null` in amazon.Client.prototype._toArray

andrewsomething/pkgcloud,Hopebaytech/pkgcloud,temka1234/pkgcloud,Phanatic/pkgcloud,apla/pkgcloud,dionjwa/pkgcloud,mcanthony/pkgcloud,hacor/pkgcloud,DonSchenck/pkgcloud,songanbui/pkgcloud,pkgcloud/pkgcloud,mdsummers/pkgcloud,Phanatic/pkgcloud,bunglestink/pkgcloud