Further check for programming group and add custom logging

Fixes CODEOCEAN-V2

app/channels/synchronized_editor_channel.rb

@@ -31,6 +31,8 @@ class SynchronizedEditorChannel < ApplicationCable::Channel
   def specific_channel
     reject unless ProgrammingGroupPolicy.new(current_user, programming_group).stream_sync_editor?
     "synchronized_editor_channel_group_#{programming_group.id}"
+  rescue NoMethodError => e
+    Sentry.capture_exception(e, extras: {current_user:, programming_group:, session_id: @session_id, identifier: @identifier})
   end
 
   def programming_group

app/policies/programming_group_policy.rb

@@ -11,7 +11,7 @@ class ProgrammingGroupPolicy < ApplicationPolicy
 
   def stream_sync_editor?
     # A programming group needs to exist for the user to be able to stream the synchronized editor.
-    return false unless @record
+    return false if @record.blank?
 
     admin? || author_in_programming_group?
   end