Fix memory leak parsing group addresses without a display name.
When there was a group address terminator with no previous addresses (including the group display-name), an address would be allocated but not attached to the address list. Change this to only allocate when last exists. It would be more correct to not allocate at all unless we are inside a group list, but I will address that in a separate commit to master.
Showing with 2 additions and 3 deletions