弹幕异常时，跳过任务

workflow/worker.py

@@ -9,7 +9,11 @@ def do_workflow(video_file, danmaku_base_file, *danmaku_files):
     if not os.path.exists(danmaku_base_file):
         ...
     result = []
-    start_ts = get_file_start(danmaku_base_file)
+    try:
+        start_ts = get_file_start(danmaku_base_file)
+    except DanmakuException:
+        print("基准弹幕文件异常，跳过")
+        return
     result.append(danmaku_to_subtitle(danmaku_base_file, 0))
     for danmaku_file in danmaku_files:
         try: