File openssh-do-not-send-empty-message.patch of Package openssh

--- openssh-8.4p1.orig/auth-pam.c	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1/auth-pam.c	2022-03-04 13:02:23.447712697 +0100
@@ -638,10 +638,12 @@
 		switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
 		case PAM_ERROR_MSG:
 		case PAM_TEXT_INFO:
-			if ((r = sshbuf_putf(loginmsg, "%s\n",
-			    PAM_MSG_MEMBER(msg, i, msg))) != 0)
-				fatal("%s: buffer error: %s",
-				    __func__, ssh_err(r));
+			if (strlen(PAM_MSG_MEMBER(msg, i, msg)) != 0) {
+				if ((r = sshbuf_putf(loginmsg, "%s\n",
+				    PAM_MSG_MEMBER(msg, i, msg))) != 0)
+					fatal("%s: buffer error: %s",
+					    __func__, ssh_err(r));
+			}
 			reply[i].resp_retcode = PAM_SUCCESS;
 			break;
 		default: