server/protocols/webadmin/webadmin-data/src/main/java/org/apache/james/webadmin/routes/GroupsRoutes.java [157:165]:
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    private void ensureNonEmptyMappings(Mappings mappings) {
        if (mappings == null || mappings.isEmpty()) {
            throw ErrorResponder.builder()
                .statusCode(HttpStatus.NOT_FOUND_404)
                .type(ErrorType.INVALID_ARGUMENT)
                .message("The group does not exist")
                .haltError();
        }
    }
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server/protocols/webadmin/webadmin-data/src/main/java/org/apache/james/webadmin/routes/ForwardRoutes.java [171:179]:
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    private void ensureNonEmptyMappings(Mappings mappings) {
        if (mappings == null || mappings.isEmpty()) {
            throw ErrorResponder.builder()
                .statusCode(HttpStatus.NOT_FOUND_404)
                .type(ErrorType.INVALID_ARGUMENT)
                .message("The forward does not exist")
                .haltError();
        }
    }
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