Links under recently-updated macro section contains null in Recommended Updates email notification

Steps to reproduce:

1. Create a new space
2. Add some pages and do some editing
3. Noticed that by default in the space home, there is a recently-updates macro section e.g.
   
4. Subscribe to Recommended Updates Email and set the Default Schedule to Daily so that the daily email message will be generated and sent at 1 p.m. in the user's configured time zone.
5. When you received the Recommended Updates email notification, clicking on any links under recently-updated macro will not redirect you to the correct links because the link contain an additional 'null' value e.g. http://localhost:8095null/display/mt/mail+test+Home instead of http://localhost:8095/display/mt/mail+test+Home
6. Affected links as highlighted under recently-updated macro section:
   
7. Mail source:

   <a href="null/display/mt/mail+test+Home" title="mail test"
   

8. This additional 'null' value can only be observed on links under recently-updated macro section