Issue with email task when no emails are found

[AlbertoMango]

starthinker/starthinker/task/email/run.py

Line 41 in ad9ff5b

exit()

The email task has a call to a non-existing exit() function when no emails are found.
This is in the email_read function.... something like 'return None' would work here.

Thank you

[Sanchayan-Bhowal]

May I work in this issue