fix killing task with missing task id

tubearchivist/home/tasks.py

@@ -138,7 +138,9 @@ def run_restore_backup():
 
 def kill_dl(task_id):
     """kill download worker task by ID"""
+    if task_id:
         app.control.revoke(task_id, terminate=True)
+
     _ = RedisArchivist().del_message("dl_queue_id")
     RedisQueue("dl_queue").clear()
 

tubearchivist/home/views.py

@@ -588,6 +588,9 @@ class PostData:
             RedisQueue("dl_queue").clear()
         elif to_execute == "kill":
             task_id = RedisArchivist().get_message("dl_queue_id")
+            if not task_id["status"]:
+                task_id = False
+            else:
                 print("brutally killing " + task_id)
             kill_dl(task_id)