Edge case: private tools could be missing an email

[denis-yuen]

Describe the bug
See dockstore/dockstore-ui2#1891 (comment)
A private author could have removed their email, code should account for this
See if there is a request since functionality is somewhat deprecated anyway

To Reproduce
See linked comment

Expected behavior
No error in the console

Additional context
2.15 release beta and associated UI (2.12)

┆Issue is synchronized with this Jira Story
┆Fix Versions: Dockstore 2.X
┆Issue Number: DOCK-2497
┆Sprint: Backlog
┆Issue Type: Story