get_avatar should ignore whitespace in email addresses
|Reported by:||evansolomon||Owned by:||nacin|
Email addresses never contain valid whitespace, so passing them to get_avatar incorrectly results in the mystery man avatar. If an email address contains whitespace we should remove it before making a request to Gravatar.
In particular, this is likely cause problems in places where an email address is likely to be pasted in, like person-specific custom post types (e.g. Employees) with email fields.