REPORT-12582 @Alex.Sung:AlphaFine本地常用问题

之前的本地常用功能，没有考虑到重启场景，需要判空后再处理。

designer-realize/src/main/java/com/fr/design/mainframe/alphafine/search/manager/impl/RecentSearchManager.java

@@ -113,7 +113,10 @@ public class RecentSearchManager implements AlphaFineSearchProvider {
      */
     private void initReader() {
         try {
-            indexWriter.close();
+            if(indexWriter != null){
+                indexWriter.close();
+            }
+            directory = FSDirectory.open(new File(path));
             indexReader = DirectoryReader.open(directory);
         } catch (IOException e) {
             FineLoggerFactory.getLogger().error(e.getMessage(), e);