Organizer: Adding speaker without email results in sessions added to "my sessions" from organizer him/herself

[mariobehling]

If an organizer adds a speaker "without email" the overview page shows the email of the organizer and sessions show up under "my sessions".

[maze-runnar]

working on it

[mariobehling]

This issue is still there just as before. Sessions still show up in https://eventyay.com/my-sessions/upcoming
Reproduce:

• Create an event
• Add sessions and speakers without email to your account and set them to accepted
• Go to https://eventyay.com/my-sessions/upcoming

Part of this issue is that these sessions are associated with the email of the event owner, if the owner does not add an email. Expected: The email field should be blank if the event owner uses the option to add sessions and speakers him or herself.