### Environment

* Dubbo version: 2.7.3
* Operating System version: win 10
* Java version: 1.8

系统启动时报
Caused by: java.lang.IllegalArgumentException: Unsupported generic type false
	at org.apache.dubbo.config.ServiceConfig.setGeneric(ServiceConfig.java:1015)

这个错误只有在2.7.3的时候存在，在使用2.7.2的时候没有
}
    @Test
    void generic() {
        ReferenceBuilder builder = new ReferenceBuilder();
        builder.generic(true);
        Assertions.assertTrue(builder.build().isGeneric());
        builder.generic(false);
        Assertions.assertFalse(builder.build().isGeneric());
    }
    @Test
    void generic1() {
        ReferenceBuilder builder = new ReferenceBuilder();
        builder.generic("generic");
        Assertions.assertEquals("generic", builder.build().getGeneric());
    }
    @Test
    void injvm() {
        ReferenceBuilder builder = new ReferenceBuilder();
        builder.injvm(true);
        Assertions.assertTrue(builder.build().isInjvm());
        builder.injvm(false);
        Assertions.assertFalse(builder.build().isInjvm());
    }
    @Test
    void lazy() {
        ReferenceBuilder builder = new ReferenceBuilder();
        builder.lazy(true);
        Assertions.assertTrue(builder.build().getLazy());
        builder.lazy(false);
        Assertions.assertFalse(builder.build().getLazy());