Cancel notifications when user tap on Details or Take Screenshot after

service died.

There are scenarios when the user is running low on resources and it
kills Shell after it start monitoring a dumpstate process, in which case
the BugreportInfo is not available anymore when the user tap a
notification action.

We could add a mechanism to recover that info (like persistenting the
user-provided values in a shared preference), but would incur in more
costs when the device is already in a resource-constrained state, so
it's better to just stop monitoring and switch back to the traditional
model where the user is notified after the bugreport finishes (the
drawback is that all user-provided information will be lost).

Also improved how info.name is checked to avoid crash in similar cases.

BUG: 27186542
BUG: 27203559
Change-Id: I57076b098a3fce493e1a27121b6e070366808668