Engine stats - docker hub

Engine name	Scores	Result count	Response time	Reliability
docker hub				0

Errors and exceptions

Exception	TypeError	Percentage	100
Parameter	'NoneType' object is not iterable
Filename	searx/engines/docker_hub.py:42
Function	response
Code	for item in body.get("summaries", []):

**Version of SearXNG, commit number if you are using on master branch and stipulate if you forked SearXNG**
Repository: https://github.com/searxng/searxng
Branch: master
Version: 2024.3.4+b7be53bb9

**How did you install SearXNG?**

**What happened?**

**How To Reproduce**

**Expected behavior**

**Screenshots & Logs**

**Additional context**

**Technical report**

Error
  * Error: TypeError
  * Percentage: 100
  * Parameters: `("'NoneType' object is not iterable",)`
  * File name: `searx/engines/docker_hub.py:42`
  * Function: `response`
  * Code: `for item in body.get("summaries", []):`

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