Exception while handling ionos API error

[JulienPalard]

In dns_ionos.py line 125 there's:

        if resp.status_code != 200:
            content = json.loads(resp.content)[0] # on error content is array with 1 element                                                       

But I got a IONOS API answer with no array, just a message, like this:

{"message":"Missing or invalid API key."}

Maybe just using error_msg = resp.reason + " " + resp.text would be more robust? I won't care reading a bit of json in my logs :D