node_config: load() returns true on parse success; main: specific diagnostics per missing field

tools/chatgui/transport/node_config.cpp

@@ -134,7 +134,7 @@ bool NodeConfig::load() {
     if (!controlIp.isEmpty() && !controlPort.isEmpty())
         m_controlAddr = controlIp + ":" + controlPort;
 
-    return !m_nodeId.isEmpty();
+    return true;
 }
 
 bool NodeConfig::save() {