am ffd0e8bf: am a6f32d7f: am 64d4ef8c: am 63889480: am 6530cca1: Fix "@null" resource values in LayoutLib. [DO NOT MERGE]

* commit 'ffd0e8bf9f803e4881736d1b2e8b54e31888e980':
  Fix "@null" resource values in LayoutLib. [DO NOT MERGE]