修复空指针异常隐患

@@ -78,6 +78,10 @@ public class ActivateUnionRest {
 			vo.setClient_type(ClientTypeEnum.IOS.getName());
 		}
 		String agent = request.getHeader("user-agent");
+		if(StringUtils.isEmpty(agent)){
+			log.warn("activateUnion failed. user-agent is null. agent is {}, request vo is {}", agent, vo);
+			return new UnionResponse(200,"success","user-agent is null");
+		}
 		String clientType = vo.getClient_type();
 		log.info("addMonitor user-agent={}", agent);
 		String[] arr = agent.split(";");