wallet2: fix exception on split txes

src/wallet/wallet2.cpp

@@ -4353,7 +4353,8 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
       }
       else
       {
-        THROW_WALLET_EXCEPTION_IF(original_output_index > dsts.size(), error::wallet_internal_error, "original_output_index too large");
+        THROW_WALLET_EXCEPTION_IF(original_output_index > dsts.size(), error::wallet_internal_error,
+            std::string("original_output_index too large: ") + std::to_string(original_output_index) + " > " + std::to_string(dsts.size()));
         if (original_output_index == dsts.size())
           dsts.push_back(tx_destination_entry(0,addr));
         THROW_WALLET_EXCEPTION_IF(memcmp(&dsts[original_output_index].addr, &addr, sizeof(addr)), error::wallet_internal_error, "Mismatched destination address");
@@ -4627,6 +4628,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
         {
           LOG_PRINT_L2("We have more to pay, starting another tx");
           txes.push_back(TX());
+          original_output_index = 0;
         }
       }
     }