fix 空指针

pcloud-service-book/src/main/java/com/pcloud/book/weixinclock/biz/impl/WeixinClockBizImpl.java

@@ -365,12 +365,12 @@ public class WeixinClockBizImpl implements WeixinClockBiz {
         LOGGER.info("content----->"+content+"weixinGroupId----->"+weixinGroupId);
         //简单过滤非关键词的词
         if (StringUtil.isEmpty(content) || content.length() > 10) {
-            return null;
+            return false;
         }
         //通过群id获取对应基本信息
         GroupClassifyQrcodeDTO classifyQrcodeInfo = bookGroupClassifyBiz.getClassifyQrcodeInfo(weixinGroupId);
         if(null == classifyQrcodeInfo){
-            return null;
+            return false;
         }
         Map<String,Object> paramMap = new HashMap<>();
         paramMap.put("bookGroupClassifyId",classifyQrcodeInfo.getClassifyId());