Handle strategies with no parameters

[brianbaquiran]

Querying a simple default feature toggle fails with KeyError: 'parameters'.

This happens because the default activation strategy does not have a parameter attached to it, e.g. the payload from the unleash server looks like this:

{'version': 1, 'features': [
    {'name': 'toggle1', 'description': 'initial feature toggle', 'enabled': True,
     'strategies': [{'name': 'default'}], 'createdAt': '2018-09-11T06:34:09.973Z'}]}

This fixes the issue.