Minor fix to "hosts" REST API query

collectagent/simplemqttserverthread.cpp

@@ -378,9 +378,9 @@ void SimpleMQTTServerMessageThread::run()
                        */
                       if (rbytes == 0) {
                           releaseConnection(connectionId);
+                      } else {
+                          lastSeen[connectionId].lastSeen = getTimestamp();
                       }
-                      
-                      lastSeen[connectionId].lastSeen = getTimestamp();
 
                       while (lbytes > 0) {
                           /*