rpc: on_send_raw_tx - add missing CHECK_CORE_READY

src/rpc/core_rpc_server.cpp

@@ -1151,6 +1151,10 @@ namespace cryptonote
         CHECK_CORE_READY();
       }
     }
+    else
+    {
+      CHECK_CORE_READY();
+    }
 
     CHECK_PAYMENT_MIN1(req, res, COST_PER_TX_RELAY, false);