Group Leader Immediate Notification email is missing a paragraph break when a new user joins

1. Go to a group and turn on immediate notifications.
2. Log out
3. Join the above group as a new member.
4. View email sent to your group leader email client.

Bug
Needs a paragraph break.

Group Leader,

the following activity just happened in your GPS Dev Group Leader Email Digest Test group.
01:54 PM EDT - The new member TestingTodd4 TestingTod4 joined the group. (Group Members Page)

Should be

Group Leader,

the following activity just happened in your GPS Dev Group Leader Email Digest Test group.

01:54 PM EDT - The new member TestingTodd4 TestingTod4 joined the group. (Group Members Page)