DO NOT MERGE Do not crash when invalid event is received

The inputlistener is sending some bad data to InputDispatcher. We
suspect it's coming from the InputReader, and is caused by uninitialized
data. While we are looking for the root cause and trying to address it
by refactoring, let's not crash and just skip handling of the bad event.

Bug: 256009910
Test: none
Change-Id: If7061e17837183b81e52f7d076b8d9a980d70ae0