SerializerBase: fix BTree Basic Serialzier handling
SerializerBase: fix BTree Basic Serialzier handling

jankotek/mapdb,cocosli/mapdb,pettermahlen/mapdb,mebigfatguy/mapdb,codeaudit/mapdb,olupas/MapDB,jankotek/MapDB,hangum/mapdb,olupas/MapDB,sumit784/mapdb,SleimanJneidi/mapdb,mebigfatguy/mapdb,ffjiao/mapdb,jankotek/mapdb,binarytemple/mapdb,ringoluo/mapdb,morfeo8marc/mapdb,jankotek/MapDB,lamfire/mapdb