ChangeJson: Fix reviewed property initialization

ChangeJson.reviewed property was not always initialized even though REVIEWED
option was provided. This breaks plugin API.

Change-Id: Ibe1cd1651d981424bcc7502a87b1f35308ba8828

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeJson.java

@@ -226,6 +226,9 @@ public class ChangeJson {
   private ChangeInfo format(ChangeData cd, Optional<PatchSet.Id> limitToPsId)
       throws OrmException {
     accountLoader = accountLoaderFactory.create(has(DETAILED_ACCOUNTS));
+    if (has(REVIEWED)) {
+      ensureReviewedLoaded(Collections.singleton(cd));
+    }
     ChangeInfo res = toChangeInfo(cd, limitToPsId);
     accountLoader.fill();
     return res;