Fix null pointer in getNetworkAgentConfigInternal

Bug: 290566631
Test: atest com.android.server.wifi

Change-Id: I90403537d85a481daf6aee26489121b1e2e6aaee
Merged-In: I90403537d85a481daf6aee26489121b1e2e6aaee
(cherry picked from commit 0a3ffa7517f2fedad763c90f6e9dafe2cc24dec9)
1 file changed