Engine stats - currency

Engine name	Scores	Result count	Response time	Reliability
currency				0

Errors and exceptions

Exception	KeyError	Percentage	100
Filename	searx/engines/currency_convert.py:37
Function	response
Code	conversion_rate = float(json.loads(json_resp)['conversion']['converted-amount'])

**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: 2023.5.6+0aade75e

**How did you install SearXNG?**

**What happened?**

**How To Reproduce**

**Expected behavior**

**Screenshots & Logs**

**Additional context**

**Technical report**

Error
  * Error: KeyError
  * Percentage: 100
  * Parameters: `()`
  * File name: `searx/engines/currency_convert.py:37`
  * Function: `response`
  * Code: `conversion_rate = float(json.loads(json_resp)['conversion']['converted-amount'])`

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