Fix layoutlib [DO NOT MERGE]

Fix a NPE.

The cherry-pick differs slightly from the original to remove changes not
relevant to the current branch.

Bug: 11140701
Change-Id: Id92fc5359acf6dde1bcdbc781aaf637fdb6eecbf
(cherry-picked from 28873c1f008f4fe24441923e14f30e55d6f0967a)
1 file changed