slawekjaranowski commented on code in PR #328:
URL: 
https://github.com/apache/maven-dependency-plugin/pull/328#discussion_r1236603544


##########
src/main/java/org/apache/maven/plugins/dependency/ListRepositoriesMojo.java:
##########
@@ -104,8 +104,10 @@ public boolean visitLeave(DependencyNode node) {
                     .collect(Collectors.groupingBy(
                             repo -> repo.getMirroredRepositories().isEmpty()));
 
-            prepareRemoteRepositoriesList(message, 
repoGroupByMirrors.get(Boolean.TRUE));
-            prepareRemoteMirrorRepositoriesList(message, 
repoGroupByMirrors.get(Boolean.FALSE));
+            prepareRemoteRepositoriesList(
+                    message, repoGroupByMirrors.getOrDefault(Boolean.TRUE, 
Collections.emptyList()));
+            prepareRemoteMirrorRepositoriesList(
+                    message, repoGroupByMirrors.getOrDefault(Boolean.FALSE, 
Collections.emptyList()));

Review Comment:
   We can also check in methods `prepareRemote*` if list is empty to avoid 
produce incomplete message.



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