- When the user requests "try again", the Network-Request-Dialog will be
recreated. If the Wi-Fi framework sends the callback result at this
time, the Network-Request-Dialog may not be ready at the moment,
causing the NPE to crash.
- Add NPE checks to avoid crash issues.
Bug: 220679437
Test: manual test
make RunSettingsRoboTests \
ROBOTEST_FILTER=NetworkRequestDialogActivityTest
Change-Id: I8e48a29649e72d9f8c67c4ac24f0eb27ba600dae
98d30c880d