[automerger skipped] Fix restorePrivateDnsSetting with null hostnames am: 7fd2b373ff -s ours
am skip reason: Merged-In Ic5d8d8b729469e0eef89a0b53f166e604264c1ee with SHA-1 908b002ed2 is already in history
Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/14911838
Change-Id: I60705cb9b8c95a156ea9e6c7bd22c2998c9885ed
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