[Mainline] Migrate TextUtils#emptyIfNull

Bug: 177477620
Test: mma
Change-Id: I0be23ae486e86864d7b3225c68ef2cfe7c7247af
1 file changed
tree: da0ff8c0f905d824887f1219d759da7a16607af6
  1. core/
  2. service/
  3. services/
  4. tests/
  5. OWNERS