Bug: Blank E-mail as a repeated entry.

Bug: Blank E-mail as a repeated entry.

I checked the "no duplicate entries" in my E-mail contact field and it works, but when I add a contact without an email zoho takes the blank space as an "duplicated entry". So I've been unable to add more contacts without emails (which field is not a mandatory requirement for my contacts).
Please fix that.
Thank you.
fitnet