Reduced useless warnings in crawl overview output

Prevents the log output from looking like this

```
03:03:21.537 [pool-8-thread-3] WARN  - Element is in an iFrame. We cannot display it in the Crawl overview
03:03:21.537 [pool-8-thread-3] WARN  - Element is in an iFrame. We cannot display it in the Crawl overview
03:05:18.980 [pool-8-thread-3] WARN  - Element is in an iFrame. We cannot display it in the Crawl overview
03:05:18.980 [pool-8-thread-3] WARN  - Element is in an iFrame. We cannot display it in the Crawl overview
03:05:44.368 [pool-8-thread-3] WARN  - Element is in an iFrame. We cannot display it in the Crawl overview
03:05:44.368 [pool-8-thread-3] WARN  - Element is in an iFrame. We cannot display it in the Crawl overview
```