### 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
}
        setProvider(
                ConfigManager.getInstance()
                        .getDefaultProvider()
                        .orElseGet(() -> {
                            ProviderConfig providerConfig = new ProviderConfig();
                            providerConfig.refresh();
                            return providerConfig;
                        })
        );
    }
    private void checkProtocol() {
        if (CollectionUtils.isEmpty(protocols) && provider != null) {
            setProtocols(provider.getProtocols());
        }
        convertProtocolIdsToProtocols();
    }
    private void convertProtocolIdsToProtocols() {
        if (StringUtils.isEmpty(protocolIds) && CollectionUtils.isEmpty(protocols)) {
            List<String> configedProtocols = new ArrayList<>();
            configedProtocols.addAll(getSubProperties(Environment.getInstance()
                    .getExternalConfigurationMap(), PROTOCOLS_SUFFIX));
            configedProtocols.addAll(getSubProperties(Environment.getInstance()
                    .getAppExternalConfigurationMap(), PROTOCOLS_SUFFIX));
            protocolIds = String.join(",", configedProtocols);
        }
        if (StringUtils.isEmpty(protocolIds)) {
            if (CollectionUtils.isEmpty(protocols)) {
                setProtocols(
                        ConfigManager.getInstance().getDefaultProtocols()