更新dao层增加真实排名非空判断

src/main/java/com/zhiwei/searchhotcrawler/dao/HotSearchCacheDAO.java

@@ -166,8 +166,8 @@ public class HotSearchCacheDAO {
                         highestRank = lastRank;
                     }
                     //判断真实最高排名
-                    if ("微博热搜".equals(type)) {
-                    if (nonNull(realLastRank) && realHighestRank < 0) {
+                    if ("微博热搜".equals(type) && nonNull(realLastRank) && nonNull(realHighestRank)) {
+                    if ( realHighestRank < 0) {
                         realHighestRank = realLastRank;
                     }
                     if (realLastRank > 0 && realHighestRank > 0 && realLastRank < realHighestRank) {