Avoid NPE for null static LinkProperties object am: d3d87114e7

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Iwlan/+/23879885

Change-Id: Ifcfbb6baf296f911be31b88349de613f22767044
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>