Mentions - mentions calling unauthenticated users should be handled better

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.X EE
• Fix Version/s: 6.2.X EE, 7.0.0 M4
• Component/s: Collaboration, Collaboration > Mentions
• Labels: None
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-plugins/pull/4278

Mentioning a user who has never signed in to portal will not generate a link when a mention would normally create a link (ex: Blogs post or Message Boards). Mentioning a user who has signed in before will generate a link to their user profile.

Steps to Reproduce:

1. Deploy Mentions Portlet
2. Create a user, but do not log in to portal with user
3. Add a blog post or message board post.
4. Mention the created user in the content field
5. Click View source and assert a link.

Expected result:
A URL is present in the link that is created, or there should be a message telling the user to log in, or url should not be generated at all.

Actual result:
A broken URL is present and nothing is linked.