logout from su when set to non passwd for users in wheel group.

[matiit]

When I login to su without a passwd in most event i'm logout when i type
something. But i see back way to do not login - hit enter when I'm logged.
When I hit enter after the log in it working well.
This happens only on bash. When I use zsh there are no problems.
My pam version is  1.0.1
My bash version is 3.2.33(1)-release (i686-pc-linux-gnu)
My /etc/pam.d/su file:
<code>

#%PAM-1.0
auth		sufficient	pam_rootok.so
auth		sufficient	pam_wheel.so debug trust  use_uid
auth		required	pam_wheel.so use_uid
auth		required	pam_unix.so
account		required	pam_unix.so
session		required	pam_unix.so</code>
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