Exception should be thrown when subscribing application addresses and 'check=true' is set.

Even if `check=true` is set, exceptions should not be thrown out on mapping absence caused by trying to do application address subscription instructed by the default `application first` policy.

```java
if (CollectionUtils.isEmpty(subscribedServices)) {
if (check) {
throw new IllegalStateException("Should has at least one way to know which services this interface belongs to, subscription url: " + url);
}
return;
}
```

The issue provides a Java snippet but no file or test path. Locate the code containing the exact IllegalStateException message and trace how the default "application first" policy handles application address subscription when no mapping exists. Resolve the contradiction between the title and body before changing behavior, then identify or add coverage for check=true with an absent mapping.

Written by the indexing model from the issue text.