Do not send notification with invalid carrierName

Bug: 169198295
Test: atest com.android.server.wifi
Change-Id: I0fd9d01974e3470feaba858e6b2071a446f40155
2 files changed
tree: 0c0445c0631ff81895b111dcc32db247eb0f785a
  1. apex/
  2. service/
  3. metrics_pdd_hook.py
  4. PREUPLOAD.cfg