* helm-mode.el (helm-comp-read): New arg quit-when-no-cand.
(helm--completion-in-region): Use it.
* helm-buffers.el (helm-buffer--match-mjm): Allow specifying more than one mjm.
* helm-regexp.el (helm-multi-occur-from-isearch): Fix prefix-arg invocation from helm buffer.
* helm-buffers.el (helm-buffer--match-mjm): Remove now unused check for mode.
* helm-buffers.el (helm-buffer--match-mjm): Allow selecting more than one positive mode.