Add select for member != nil

Author: TobiasDeBruijn

app/controllers/admin/payments_controller.rb

@@ -30,6 +30,7 @@ def index
     @late_activities = Activity.debtors.select do |activity|
       (Date.today.prev_occurring(:friday) - activity.payable_updated_at).to_i >= 21 && activity.is_payable
     end
+
     @late_payments =
       @late_activities.map do |activity|
         activity.attendees.select do |participant|
@@ -39,7 +40,9 @@ def index
               (participant.price.nil? &&
                activity.price && activity.price > 0)
             )
-        end.map(&:member)
+        # Somehow there were `nil` members in this list, not sure how we got there,
+        # but the `select` makes the page useable.
+        end.map(&:member).select{ |member| member != nil }
       end.flatten.uniq
     @late_unpayable_activities = Activity.late_unpayable
   end