tx_pool: catch exceptions in LockedTXN dtor

This might prevent some calls to terminate when the LockedTXN
dtor is called as part of stack unwinding caused by another
exception in the first place.

src/cryptonote_core/tx_pool.cpp

@@ -92,7 +92,7 @@ namespace cryptonote
       LockedTXN(Blockchain &b): m_blockchain(b), m_batch(false) {
         m_batch = m_blockchain.get_db().batch_start();
       }
-      ~LockedTXN() { if (m_batch) { m_blockchain.get_db().batch_stop(); } }
+      ~LockedTXN() { try { if (m_batch) { m_blockchain.get_db().batch_stop(); } } catch (const std::exception &e) { MWARNING("LockedTXN dtor filtering exception: " << e.what()); } }
     private:
       Blockchain &m_blockchain;
       bool m_batch;