Considering the webapp itself doesn't function with JavaScript disabled, that sounds like a feature instead of a bug. It keeps people that will never be their customers out and away from their support queue.
I clicked on a news announcement for a product that I currently know very little about and this will be my first engagement with ANYTHING they have published. Would their impression on me be better if I get a giant white screen, or if I get a note saying that their page requires javascript?
Regardless of my engagement with the product, it is certainly a bad assumption to say that everyone blocking javascript is not a potential customer.