For no tags with Helm, try setting variable org-roam-node-display-template without the length specifiers like this:
(setq org-roam-node-display-template` "${title} ${tags}")
;; default is "${title:*} ${tags:10}"
;; remove :* and :10
If you are on Emacs 27.2, you might get tags duplicated (@mattc, you might like to send a PR with your change, perhaps?)
If you get this problem, remove the tags part of the template like this:
(setq org-roam-node-display-template` "${title} ") ;; Add space after the closing bracket "}")
