Fix NPE in BssidBlocklistMonitor

Due to unexpected orderings of events happening in ClientModeImpl,
sometimes invalid inputs are being passed to BssidBlocklistMonitor to
cause a NPE.

This patch fixes the crash but does not address the root cause.

Bug: 159183809
Test: atest com.android.server.wifi
Change-Id: I6991b29949f9799662b8d29a4e0621fed9ff8cf2
2 files changed
tree: c1d7e982b649d348592954a99e9cdf3284d5ffa4
  1. apex/
  2. service/
  3. metrics_pdd_hook.py
  4. PREUPLOAD.cfg