Optional security for webservice not working

[DidelotK]

Description

Using an empty security rule return a 401

Expected behaviour

Should allow the request and return a 200

Actual behaviour

It returns a 401

Steps to reproduce

security:
- {}

Additional info:

Output of the commands:

• python --version: Python 3.5.3
• pip show connexion | grep "^Version\:": Version: 2.2.0