model: remove unused 'subject' parameter of NotificationModel.create() The subject of emails is determined with EmailNotificationModel._subj_map, based on the notification type. The 'subject' parameter passed to NotificationModel.create is completely unused. Remove this parameter and update its callers, removing code that is now no longer used.

pytest >= 4.6.6, < 5.5
pytest-sugar >= 0.9.2, < 0.10
pytest-benchmark >= 3.2.2, < 3.3
pytest-localserver >= 0.5.0, < 0.6
mock >= 3.0.0, < 4.1
Sphinx >= 1.8.0, < 3.1
WebTest >= 2.0.6, < 2.1
isort == 5.1.2
pyflakes == 2.2.0