Modified __init__.py to keep up with password/username validation requirement changes #340
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Related to #410, and this Asana task.
Also related to this pull request.
Since the new username validation no longer allows for underscores in the username, this changes all instances of
_cs50tocs-50.Also added several checks to ensure the student validated the usernames and passwords, and edited test cases which would pass check50 due to the student forgetting to check a blank entry but remembering to validate the passwords/usernames.