Fix use of 'e' before assignement

[TheoLechemia]

The returned response is more readable.

I also try to fix the wrong status code (200 look like to be hard coded even if the request fail : https://github.com/istSOS/istsos2/blob/master/application_istsoslib.py#L152), but I don't find a correct way to do it without breraking stuff .. :/