wallet2: only add a dummy 0 output if there's one output otherwise

src/wallet/wallet2.cpp

@@ -4662,6 +4662,8 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
   cryptonote::tx_destination_entry change_dts = AUTO_VAL_INIT(change_dts);
   change_dts.amount = found_money - needed_money;
   if (change_dts.amount == 0)
+  {
+    if (splitted_dsts.size() == 1)
     {
       // If the change is 0, send it to a random address, to avoid confusing
       // the sender with a 0 amount output. We send a 0 amount in order to avoid
@@ -4672,12 +4674,14 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
       dummy.generate();
       change_dts.addr = dummy.get_keys().m_account_address;
       LOG_PRINT_L2("generated dummy address for 0 change");
+      splitted_dsts.push_back(change_dts);
+    }
   }
   else
   {
     change_dts.addr = get_subaddress({subaddr_account, 0});
-  }
     splitted_dsts.push_back(change_dts);
+  }
 
   crypto::secret_key tx_key;
   std::vector<crypto::secret_key> additional_tx_keys;