Fix a null pointer exception in ClientModeImpl

Since AP MLD MAC address is added as a new parameter in the existing
AIDL interface, it can come as null. Add a check against null pointer
exception while updating the affiliated bssid mapping in block list.

Bug: 273426405
Test: atest com.android.server.wifi.ClientModeImplTest

Change-Id: I496ce22f38e71b4278dbc7ce53cb1dc0e0d8ee46
1 file changed