Ignore inactive reviewers in groups

Previously, having an inactive reviewer in a group, and adding that
group as a reviewer through the plugin would cause none of the other
group members to be added. This change allows for adding only active
reviewers in a group.

Change-Id: I519437fc124ff873ab5c397421cb70c29cfd542c
diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewers/DefaultReviewers.java b/src/main/java/com/googlesource/gerrit/plugins/reviewers/DefaultReviewers.java
index a26e6c1..1d5dac4 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewers/DefaultReviewers.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/reviewers/DefaultReviewers.java
@@ -64,8 +64,10 @@
       in.reviewers = new ArrayList<>(reviewers.size());
       for (Account account : reviewers) {
         AddReviewerInput addReviewerInput = new AddReviewerInput();
-        addReviewerInput.reviewer = account.getId().toString();
-        in.reviewers.add(addReviewerInput);
+        if (account.isActive()) {
+          addReviewerInput.reviewer = account.getId().toString();
+          in.reviewers.add(addReviewerInput);
+        }
       }
       gApi.changes().id(change.getId().get()).current().review(in);
     } catch (RestApiException e) {