fix: 修复redis删除锁，key为空的BUG

lottery-infrastructure/src/main/java/com/seamew/lottery/infrastructure/repository/ActivityRepository.java

@@ -173,7 +173,7 @@ public class ActivityRepository implements IActivityRepository {
     @Override
     public void recoverActivityCacheStockByRedis(Long activityId, String tokenKey, String code) {
         // 删除分布式锁 Key
-        if (StringUtils.isNotEmpty(redisUtil.get(tokenKey))) {
+        if (StringUtils.isNotEmpty(tokenKey) && StringUtils.isNotEmpty(redisUtil.get(tokenKey))) {
             redisUtil.del(tokenKey);
         }
     }

lottery-infrastructure/src/main/java/com/seamew/lottery/infrastructure/repository/StrategyRepository.java

@@ -128,7 +128,7 @@ public class StrategyRepository implements IStrategyRepository {
 
     @Override
     public void recoverAwardCacheStockByRedis(String tokenKey) {
-        if (StringUtils.isNotEmpty(redisUtil.get(tokenKey))) {
+        if (StringUtils.isNotEmpty(tokenKey) && StringUtils.isNotEmpty(redisUtil.get(tokenKey))) {
             redisUtil.del(tokenKey);
         }
     }