add better logging, and fix issue when course (00000) unknown

cnd.rb

@@ -54,11 +54,15 @@ end
 
 $config.each_key do |course|
   puts "Course #{course}"
-  next if $config[course]
+  next unless $config[course]
   $users = Hash.new {|h,k| h[k] = Hash.new &h.default_proc }
   $groups = Hash.new {|h,k| h[k] = Hash.new &h.default_proc }
 
   r = get_group_members($config[course]["element"], course)
+  unless r and r["UserElementRelation"]
+    puts "No groups!"
+    next
+  end
   add_users_and_groups(r, "Main")
 
   all_groups = get_groups($config[course]["element"], course)
@@ -109,6 +113,8 @@ $config.each_key do |course|
     end
   end
 
+  puts "  got #{$users.keys.count} users and #{$groups.keys.count} groups"
+
   File.open("/dumps/" + course + "-users.yaml",'w') do |h|
     h.write $users.to_yaml
   end