Update build.py

Author: God-2077

package/build.py

@@ -41,6 +41,9 @@ def main():
 
     success_count = 0
     task_error_list = []
+    if len(config) == 0:
+        print("无任务")
+        sys.exit(0)
     # 遍历所有打包任务
     for i, task in enumerate(config, start=1):
         try:
@@ -157,4 +160,4 @@ def main():
         sys.exit(0)
 
 if __name__ == '__main__':
-    main()
+    main()