dhtrunner: use proxy by default if configured

include/opendht/dhtrunner.h

@@ -383,7 +383,7 @@ public:
             return;
         config_.proxy_server = proxy;
         config_.push_node_id = pushNodeId;
-        enableProxy(use_proxy);
+        enableProxy(use_proxy and not config_.proxy_server.empty());
     }
 
     /**

src/dhtrunner.cpp

@@ -91,10 +91,8 @@ DhtRunner::run(const SockAddr& local4, const SockAddr& local6, DhtRunner::Config
     dht_ = std::unique_ptr<SecureDht>(new SecureDht(std::move(dht), config.dht_config));
 
 #if OPENDHT_PROXY_CLIENT
-    if (!dht_via_proxy_) {
     config_ = config;
-        enableProxy(use_proxy);
-    }
+    enableProxy(not config_.proxy_server.empty());
 #endif
 
     running = true;