Mass Email Skip on Null

[alehawk]

Hi!
I migrated my forum from WWF to pbpBB and some fields from the user profile werent migrated like the email address.
Is there anyway I can use the mass email system and dont get an error when the user email is null?
All my new users has an email address but some old doesnt. And I would like to skip the null email addresses instead of getting an error.
Tnx!