快递单号前缀为null的输出空 fix

app/OrderPackage.php

@@ -257,7 +257,7 @@ class OrderPackage extends Model
     }
     public function getLogisticNumberAttribute($val)
     {
-        if(strpos($val,'null')===false)return '';
+        if(strpos($val,'null')!==false)return '';
         return $val;
     }
 }