Why when a task is marked as “Stalled” the following tasks can't automatically processed?
why when there's a task marked as “Stalled” in the Control Panel, this one is not ignored to automatically let the following tasks processing?


Because tasks behind it might rely on the data that the successful completion of the stalled task would generate.


  And is there a way to automatically ignored these tasks marked as “Stalled”?


You could probably hack it somehow, but I wouldn't recommend it.  It's best to fix the underlying reason the task stalled in the first place.