check data size is over 0

task-executor-kit/src/main/java/com/mushiny/task/TaskExecutor.java

 package com.mushiny.task;
 
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Objects;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -56,6 +57,9 @@ public class TaskExecutor<T, U, R> {
     public boolean execute() {
         TaskDefinition<T, U, R> t = this.task;
         Collection<T> data = t.getData();
+        if (null == data || data.isEmpty()) {
+            return false;
+        }
         countDownLatch = new CountDownLatch(data.size());
         AtomicInteger failCount = new AtomicInteger();
         data.forEach(d -> pool.execute(() -> {