change datasource null check position (#1883)

dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/worker/task/sql/SqlTask.java

@@ -123,19 +123,21 @@ public class SqlTask extends AbstractTask {
         }
 
         dataSource= processDao.findDataSourceById(sqlParameters.getDatasource());
-        logger.info("datasource name : {} , type : {} , desc : {}  , user_id : {} , parameter : {}",
-                dataSource.getName(),
-                dataSource.getType(),
-                dataSource.getNote(),
-                dataSource.getUserId(),
-                dataSource.getConnectionParams());
 
+        // data source is null
         if (dataSource == null){
             logger.error("datasource not exists");
             exitStatusCode = -1;
             return;
         }
 
+        logger.info("datasource name : {} , type : {} , desc : {}  , user_id : {} , parameter : {}",
+                dataSource.getName(),
+                dataSource.getType(),
+                dataSource.getNote(),
+                dataSource.getUserId(),
+                dataSource.getConnectionParams());
+
         Connection con = null;
         List<String> createFuncs = null;
         try {