fix access control when no backend could be found (might need work)

servers/slapd/slapacl.c

@@ -222,9 +222,18 @@ slapacl( int argc, char **argv )
 		op->o_bd = frontendDB;
 	}
 
-	if ( !dryrun && be ) {
+	if ( !dryrun ) {
 		ID	id;
 
+		if ( be == NULL ) {
+			fprintf( stderr, "%s: no target database "
+				"has been found for baseDN=\"%s\"; "
+				"you may try with \"-u\" (dry run).\n",
+				baseDN.bv_val, progname );
+			rc = 1;
+			goto destroy;
+		}
+
 		if ( !be->be_entry_open ||
 			!be->be_entry_close ||
 			!be->be_dn2id_get ||

servers/slapd/slapcommon.c

@@ -576,7 +576,7 @@ startup:;
 	mal_leaktrace(1);
 #endif
 
-	if ( !dryrun && slap_startup( be ) ) {
+	if ( !dryrun && be && slap_startup( be ) ) {
 		switch ( tool ) {
 		case SLAPTEST:
 			fprintf( stderr, "slap_startup failed "