possible crash when cluster is nil

[johrstrom]

It's not clear how this happened, but Summer reported this issue where the app crashes and users are shown that "Internal Server Error" phusion passenger page with a stack trace. It appears to have been intermittent and was resolved by logging out then in.

Even so, some safe-guard may be appropriate to either show no clusters or to retry?

Here's the log output and stacktrace:

App 90908 output: 2020-11-30 09:50:23 - NoMethodError - undefined method `friendly_error_message' for nil:NilClass:
App 90908 output: 	/var/www/ood/apps/sys/systemstatus/app.rb:115:in `block (2 levels) in <top (required)>'
App 90908 output: 	/var/www/ood/apps/sys/systemstatus/app.rb:115:in `map'
App 90908 output: 	/var/www/ood/apps/sys/systemstatus/app.rb:115:in `block in <top (required)>'
App 90908 output: 	/opt/ood/ondemand/root/usr/share/gems/2.5/ondemand/1.8.18/gems/sinatra-2.1.0/lib/sinatra/base.rb:1675:in `call'
App 90908 output: 	/opt/ood/ondemand/root/usr/share/gems/2.5/ondemand/1.8.18/gems/sinatra-2.1.0/lib/sinatra/base.rb:1675:in `block in compile!'
App 90908 output: 	/opt/ood/ondemand/root/usr/share/gems/2.5/ondemand/1.8.18/gems/sinatra-2.1.0/lib/sinatra/base.rb:1013:in `block (3 levels) in route!'