Engine stats - currency

Engine name	Scores	Result count	Response time	Reliability
currency				0

Errors and exceptions

Exception	KeyError	Percentage	50
Filename	searx/engines/currency_convert.py:37
Function	response
Code	conversion_rate = float(json.loads(json_resp)['conversion']['converted-amount'])

Exception	httpx.HTTPStatusError	Percentage	50
Parameter	400Bad Requestduckduckgo.com
Filename	searx/search/processors/online.py:113
Function	_send_http_request
Code	response = req(params['url'], **request_args)

**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: 2022.12.23-e8f72d70-dirty

**How did you install SearXNG?**

**What happened?**

**How To Reproduce**

**Expected behavior**

**Screenshots & Logs**

**Additional context**

**Technical report**

Error
  * Error: KeyError
  * Percentage: 50
  * Parameters: `()`
  * File name: `searx/engines/currency_convert.py:37`
  * Function: `response`
  * Code: `conversion_rate = float(json.loads(json_resp)['conversion']['converted-amount'])`

Error
  * Error: httpx.HTTPStatusError
  * Percentage: 50
  * Parameters: `('400', 'Bad Request', 'duckduckgo.com')`
  * File name: `searx/search/processors/online.py:113`
  * Function: `_send_http_request`
  * Code: `response = req(params['url'], **request_args)`

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