crm booklsit bugs

app/Modules/Book/Services/CrmBookAutoRecommendService.php

@@ -85,7 +85,9 @@ class CrmBookAutoRecommendService
          return json_decode($value, true);
       } else {
          $results = $this->getRecommendBooksFromDB();
-         Redis::setex($this->redis_key, SysConsts::ONE_WEEK_SECONDS, json_encode($results));
+          if($results){
+              Redis::setex($this->redis_key, SysConsts::ONE_WEEK_SECONDS, json_encode($results));
+          }
          return $results;
       }
    }