PM-509 Fixed a bug causing the Plugin to crash during Invoice creation.
PM-388 Payment methods will only be available for payment if both keys are set in the config
Merge branch 'hotfix/3.0.5'
Merge branch 'hotfix/3.0.5' into develop
Merge branch 'develop' of https://github.com/paymill/paymill-magento
Merge branch 'master' of https://github.com/paymill/paymill-magento