Solve the sonar bug.

dolphinscheduler-alert/src/main/java/org/apache/dolphinscheduler/alert/runner/AlertSender.java

@@ -142,6 +142,7 @@ public class AlertSender {
             alertResultExtend.setStatus("false");
             alertResultExtend.setMessage(message);
             logger.error("Alert Plugin {} send error : not found plugin {}", pluginInstanceName, pluginName);
+            return alertResultExtend;
         }
 
         AlertInfo alertInfo = new AlertInfo();

pom.xml

@@ -917,6 +917,7 @@
                         <include>**/service/zk/ZKServerTest.java</include>
                         <include>**/service/zk/CuratorZookeeperClientTest.java</include>
                         <include>**/service/queue/TaskUpdateQueueTest.java</include>
+                        <include>**/service/alert/AlertClientServiceTest.java</include>
 
                         <include>**/dao/mapper/DataSourceUserMapperTest.java</include>
                         <!--<iTaskUpdateQueueConsumerThreadnclude>**/dao/mapper/ErrorCommandMapperTest.java</iTaskUpdateQueueConsumerThreadnclude>-->