To email address is not handled properly when name is omitted

[bbottema]

Currently the use case where the name is actually the email address is currently not handled properly, resulting in a name with the value of the actual email address and a null-email address.

The only way to handle this without complete email address validation is by assuming it is both the name and address if it might be an email address.

Originally reported by @Faelean in #25 (comment)

[bbottema]

Fix released in 1.7.2

[bbottema]

Your heads up is greatly appreciated, @Faelean!