Fix admin login to tracker

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/DeviceManagementServiceImpl.java

@@ -476,6 +476,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             JSONObject obj = new JSONObject(DeviceAPIClientServiceImpl.returnUser(currentUser));
 
             log.info("=================");
+            log.info(currentUser);
             log.info(obj.toString());
             log.info("==================");
             if(obj.has("error")){

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/traccar/api/service/addons/TraccarClientImpl.java

@@ -176,7 +176,9 @@ public class TraccarClientImpl implements TraccarClient {
 
                 traccarUser.setId(obj.getInt("id"));
                 traccarUser.setName(obj.getString("name"));
+                if(!obj.isNull("login")){
                     traccarUser.setLogin(obj.getString("login"));
+                }
                 traccarUser.setEmail(obj.getString("email"));
                 traccarUser.setDeviceLimit(obj.getInt("deviceLimit"));
                 traccarUser.setUserLimit(obj.getInt("userLimit"));