It is possible for a tasks not to have been saved to the
persisted recent list yet for various reasons. This causes
some external calls to fail when they are trying to do
an operation on a task with a given id. We now use the
stack supervisor look-up for a task id that checks
everywhere a task might be including live stack. It this
fails then the task truly doesn't exist.
Bug: 22924782
Change-Id: I57c3df41d0b4f3ee3c5ae9b7d01eeb2b352062b4
a0ef49c44f