Fixed empty query

Author: germanosin

api/src/main/java/io/kafbat/ui/service/index/FilterTopicIndex.java

@@ -3,6 +3,7 @@
 import static org.apache.commons.lang3.Strings.CI;
 
 import io.kafbat.ui.model.InternalTopic;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Stream;
 
@@ -15,6 +16,9 @@ public FilterTopicIndex(List<InternalTopic> topics) {
 
   @Override
   public List<InternalTopic> find(String search, Boolean showInternal, String sort, Integer count) {
+    if (sort == null || sort.isBlank()) {
+      return new ArrayList<>(this.topics);
+    }
     Stream<InternalTopic> stream = topics.stream().filter(topic -> !topic.isInternal()
             || showInternal != null && showInternal)
         .filter(

api/src/main/java/io/kafbat/ui/service/index/LuceneTopicsIndex.java

@@ -119,6 +119,9 @@ public List<InternalTopic> find(String search, Boolean showInternal, String sort
 
   public List<InternalTopic> find(String search, Boolean showInternal,
                            String sortField, Integer count, float minScore) {
+    if (search == null || search.isBlank()) {
+      return new ArrayList<>(this.topicMap.values());
+    }
     closeLock.readLock().lock();
     try {
       Query nameQuery;