Null check before attempting to key database

Author: developernotes

src/net/sqlcipher/database/SQLiteDatabase.java

@@ -2329,7 +2329,9 @@ private void openDatabaseInternal(char[] password, SQLiteDatabaseHook databaseHo
             databaseHook.preKey(this);
         }
 
-        native_key(password);
+        if(password != null){
+          native_key(password);
+        }
 
         if(databaseHook != null){
             databaseHook.postKey(this);