improved tag inheritance

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

task/src/main/java/de/srsoftware/umbrella/task/TaskModule.java

@@ -361,10 +361,13 @@ public class TaskModule extends BaseHandler implements TaskService {
 		// do actual member assignment
 		for (var entry : newMembers.entrySet()) taskDb.setMember(task.id(), entry.getKey(), entry.getValue());
 
+		Collection<String> tagList = null;
 		if (json.has(TAGS) && json.get(TAGS) instanceof JSONArray arr) {
-			var tagList = arr.toList().stream().filter(e -> e instanceof String).map(String.class::cast).toList();
-			tagService().save(TASK,task.id(),null,tagList);
+			tagList = arr.toList().stream().filter(e -> e instanceof String).map(String.class::cast).toList();
 		}
+		if ((tagList == null || tagList.isEmpty()) && parentTask != null) tagList = tagService().getTags(TASK, parentTask.id(), user);
+		if ((tagList == null || tagList.isEmpty())) tagList = tagService().getTags(PROJECT, projectId, user);
+		if (tagList != null && !tagList.isEmpty()) tagService().save(TASK, task.id(), null, tagList);
 		return sendContent(ex, loadMembers(task));
 	}