The comma that comes between serial adjectives (as in "big, bad wolf") is not always needed in English. It all comes down to what you're trying to describe with the first (outermost) adjective. If the wolf is big and bad, then the comma goes in place of the "and". If you're just saying that the bad wolf is big, no comma is needed.
That's a weird example, I know. Here's a reference: http://www.quickanddirtytips.com/education/grammar/commas-with-adjectives
In the example of "delicious chocolate cake", no comma is needed whether "chocolate" is analyzed as an adjective or a noun. I'd expect since the sense of these modifiers is cumulative (see the reference), no comma would be needed in Esperanto either.