fix 修复 关闭 sse 报错问题

ruoyi-common/ruoyi-common-sse/src/main/java/org/dromara/common/sse/controller/SseController.java

@@ -7,6 +7,7 @@ import org.dromara.common.core.domain.R;
 import org.dromara.common.satoken.utils.LoginHelper;
 import org.dromara.common.sse.core.SseEmitterManager;
 import org.dromara.common.sse.dto.SseMessageDto;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.http.MediaType;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -15,6 +16,7 @@ import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
 import java.util.List;
 
 @RestController
+@ConditionalOnProperty(value = "sse.enabled", havingValue = "true")
 @RequiredArgsConstructor
 public class SseController {