Description of problem:
Cannot access web gui of Satellite 6.2 post upgrade from 6.1.9

Version-Release number of selected component (if applicable):
6.2.0

Actual results:
NoMethodError
undefined method `label' for nil:NilClass
/opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.68/app/models/katello/content_view_history.rb:45:in `humanized_action'
/opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.68/app/views/dashboard/_content_views_widget.html.erb:28:in `block in _deaf917e969ddf5506e90626258d8e21'
/opt/rh/rh-ror41/root/usr/share/gems/gems/activerecord-4.1.5/lib/active_record/relation/delegation.rb:46:in `each'
/opt/rh/rh-ror41/root/usr/share/gems/gems/activerecord-4.1.5/lib/active_record/relation/delegation.rb:46:in `each'
/opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.68/app/views/dashboard/_content_views_widget.html.erb:21:in `_deaf917e969ddf5506e90626258d8e21'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/template.rb:145:in `block in render'
/opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/notifications.rb:161:in `instrument'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/template.rb:339:in `instrument'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/template.rb:143:in `render'
/opt/theforeman/tfm/root/usr/share/gems/gems/deface-1.0.2/lib/deface/action_view_extensions.rb:41:in `render'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/renderer/partial_renderer.rb:306:in `render_partial'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/renderer/partial_renderer.rb:279:in `block in render'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
/opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/notifications.rb:159:in `block in instrument'
/opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/notifications.rb:159:in `instrument'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/renderer/partial_renderer.rb:278:in `render'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/renderer/renderer.rb:51:in `render_partial'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/renderer/renderer.rb:25:in `render'
/opt/rh/rh-ror41/root/usr/share/gems/gems/actionview-4.1.5/lib/action_view/helpers/rendering_helper.rb:32:in `render'
/usr/share/foreman/app/helpers/dashboard_helper.rb:39:in `render_widget'
/usr/share/foreman/app/views/dashboard/index.html.erb:20:in `block (2 levels) in _8653514f9141cd246c721c97190f24cd'

Expected results:
Access to GUI is available.

Additional info:
All commands seem OK via hammer cli tool (including content views)

Debug enabled production.log shows no more information than the stack trace:-
016-08-07 09:47:32 [app] [I]   Rendered /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.68/app/views/dashboard/_errata_widget.html.erb (8357.0ms)
2016-08-07 09:47:32 [app] [I]   Rendered /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.68/app/views/dashboard/_content_views_widget.html.erb (44.4ms)
2016-08-07 09:47:32 [app] [I]   Rendered dashboard/index.html.erb within layouts/application (17885.1ms)
2016-08-07 09:47:32 [app] [W] Action failed
 | NoMethodError: undefined method `label' for nil:NilClass
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.68/app/models/katello/content_view_history.rb:45:in `humanized_action'
 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.68/app/views/dashboard/_content_views_widget.html.erb:28:in `block in _deaf917e969ddf5506e90626258d8e21'