Use try shorthand and check for ServiceDesk addon.

lib/gitlab/usage_data.rb

@@ -54,9 +54,7 @@ module Gitlab
       end
 
       def service_desk_counts
-        license = ::License.current
-        return {} if license.nil?
-        return {} unless license.add_on?('GitLab_ServiceDesk')
+        return {} unless ::License.current&.add_on?('GitLab_ServiceDesk')
 
         projects_with_service_desk = Project.where(service_desk_enabled: true)