fixed bug in search adapter

app/src/main/java/acr/browser/lightning/database/HistoryDatabase.java

@@ -65,7 +65,7 @@ public class HistoryDatabase extends SQLiteOpenHelper {
         onCreate(db);
     }
 
-    private boolean isClosed() {
+    public boolean isClosed() {
         return mDatabase == null || !mDatabase.isOpen();
     }
 

app/src/main/java/acr/browser/lightning/object/SearchAdapter.java

@@ -232,7 +232,7 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
                 }
 
             }
-            if (mDatabaseHandler == null) {
+            if (mDatabaseHandler == null || mDatabaseHandler.isClosed()) {
                 mDatabaseHandler = HistoryDatabase.getInstance(mContext.getApplicationContext());
             }
             List<HistoryItem> historyList = mDatabaseHandler.findItemsContaining(constraint.toString());