Metadata overview 500s if not logged in

[saracarl]

To reproduce: Sign out Visit https://fromthepage.com/stefansson-wrangel-09-36-017/wrangel-island-set/32025492/metadata_overview

[saracarl]

wrap this in some sort of "if logged in"

[saracarl]

Error message: undefined method `slug' for nil:NilClass

/home/fromthepage/deployment/releases/20221025204017/app/views/work/metadata_overview.html.slim:49:in `_app_views_work_metadata_overview_html_slim___358607836671677422_743020'

[benwbrum]

See also #3575 -- possible duplicate, although the error messages are different.