fix return, obj error (#1855)

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/ExecutorService.java

@@ -551,6 +551,8 @@ public class ExecutorService extends BaseService{
             command.setCommandParam(JSONUtils.toJson(cmdParam));
             return processDao.createCommand(command);
         }
+
+        return 0;
     }
 
     /**

dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/model/DateInterval.java

@@ -35,12 +35,15 @@ public class DateInterval {
 
     @Override
     public boolean equals(Object obj) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-        DateInterval that = (DateInterval) o;
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        } else if (this == obj) {
+            return true;
+        } else {
+            DateInterval that = (DateInterval) obj;
             return startTime.equals(that.startTime) &&
                     endTime.equals(that.endTime);
-        
+        }
     }
 
     public Date getStartTime() {