tty: do not print extra newline after empty messages

In case nothing (not even nil) is returned then do not print newline
after the zero-length message. This avoids unambiguous empty line in
output (is it an empty string which got printed?).

daemon/io.c

@@ -704,7 +704,7 @@ void io_tty_process_input(uv_stream_t *stream, ssize_t nread, const uv_buf_t *bu
 			FILE *fp_out = ret ? stderr : stdout;
 			if (message)
 				fprintf(fp_out, "%s", message);
-			if (message || !args->quiet)
+			if (message && !args->quiet)
 				fprintf(fp_out, "\n");
 			fprintf(fp_out, "%s", delim);
 		}

utils/client/kresc.c

@@ -421,7 +421,7 @@ static int interact()
 				return 1;
 			}
 			printf("%s", msg);
-			if (msg_len == 0 || msg[msg_len - 1] != '\n') {
+			if (msg_len > 0 && msg[msg_len - 1] != '\n') {
 				printf("\n");
 			}
 			if (hist_file) {