[automerge] Restore the null behavior of buildWifiTemplate 2p: 4c0fb401be

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/22503686

Bug: 273963543
Change-Id: I1f0c2497869e8539d84e2c39780df4bf91458cc3