Do not crash when adding UID ranges to a destroyed network.

aosp/3218864 fixed the crash when ranges are removed from a
destroyed network, but did not fix the case where the ranges are
added to a destroyed network.

This can happen if a multilayer request is filed when a network
has already been destroyed.

Fix: 368989698
Test: updated existing tests for this bug
Change-Id: I7184eaa01141f56b7ad774277c7dee03d5812298
2 files changed