Annotate methods that return a definitely null value with @Nullable

We intend to enable the ReturnMissingNullable errorprone pattern in
Gerrit core and this fixes the current issues.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Id502fba86964c0c9b8df5fd586a1d98aa53137bf
2 files changed
tree: e05da468e0c0d5ccff713b8b8450cfafc77c8ceb
  1. .settings/
  2. src/
  3. .gitignore
  4. BUILD
  5. LICENSE