在当前master（2.7.5-snapshot）分支中demo模块启动失败,请关注AbstractInterfaceConfig该类实现

https://github.com/apache/dubbo/blob/master/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractInterfaceConfig.java

对比2.7.4中release代码发现当前master（2.7.5-snapshot）存在bug，
`

ConfigManager configManager = ConfigManager.getInstance();
ConfigCenterConfig cc = (ConfigCenterConfig)configManager.getConfigCenter().orElse(new ConfigCenterConfig());
if (rc.getParameters() != null) {
Map configParams = cc.getParameters() == null ? new HashMap() : cc.getParameters();
((Map)configParams).putAll(rc.getParameters());
cc.setParameters((Map)configParams);
}
cc.getParameters().put("client", rc.getClient());

`

rc.getParameters()为空的情况下cc.getParameters()为空，导致 cc.getParameters().put("client", rc.getClient());抛空指针