Test passing an underlying network array with null network in it.

Current code treats these nulls as if they weren't there.

Bug: 172870110
Test: test-only change
Change-Id: Id4632e1b004c09910b4b7613f7233d2c19e2f0ac
Merged-In: Id4632e1b004c09910b4b7613f7233d2c19e2f0ac
(cherry picked from commit eccd2623)