Merge branch 'stable-2.15'

* stable-2.15:
  Bazel: Silent zip output in gerrit-antlr:query_antlr rule
  Provide mvn command output when VERBOSE set
  ReviewerRecommender: Prevent NPE when changeNotes is null
  ReviewerSuggestion: More Javadoc improvements

Change-Id: I433e257961e14b38332997daea8c6e39c42b7d98

java/com/google/gerrit/server/restapi/change/ReviewerRecommender.java

@@ -130,7 +130,7 @@ public class ReviewerRecommender {
                   .get()
                   .suggestReviewers(
                       projectState.getNameKey(),
-                      changeNotes.getChangeId(),
+                      changeNotes != null ? changeNotes.getChangeId() : null,
                       query,
                       reviewerScores.keySet()));
       String key = plugin.getPluginName() + "-" + plugin.getExportName();