Annie Meng 20b4d846ed Fix NPE in restoring network policies
When backing up network policies, we write null for policies that are
null or are inferred. When restoring, this sends null policies to be set
which results in a NPE.

Bug: 79961560
Test: 1) atest NetworkPolicyManagerServiceTest
2) Manual: adb restore using backup set with null policies does not
crash

Change-Id: I450685e38acae0658ea984b86ca8b17ca27a71a6
2018-05-21 13:52:16 +01:00
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