No action is/- required on your side

I received an email from my university that the following sentence was part of it:

We confirmed everything, no action required on your part.

Looking up in the LDOCE dictionary, I think the correct sentence must be "no action is required" according to the two meanings there. Can anyone confirm me?

PS: I would be grateful if you could point me to the grammatical errors in the question if you spot any.

Solution 1:

You are correct, but most people would accept the grammatically incorrect version.
A comma is not the right punctuation and for the sentence to be more nearly correct it would have to be put in parenthesis-still, is, as you point out would be needed to make it totally correct.