Guard against NPE in SendBug

Add some null checks in case that SendBug is invoked while system
server is in fact not running, e.g. during a runtime restart. So
that we don't hit NPE in SendBug, looking suspiciously like the
cause rather than a consequence of the real issue.

Bug: 7097125

Change-Id: I82676ab936fe19a781c32f949e6e429eb4045d63
1 file changed