Merge "Return for getBlockedPorts NonNull" into main am: c3a188d7dc

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2301890

Change-Id: I3329bb4e043a088719c2db5d6b362d4c83ece9ee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>