If children is null, don't have an error.
If children is null, don't have an error.

It seems sometimes children can be null. I'm not exactly sure why,
perhaps when the LocalizedHtml placeholder does not have any children.
This may fix the 'e is null' errors we have been seeing on production.

chuckharmston/testpilot,mozilla/idea-town,mozilla/idea-town-server,lmorchard/idea-town,lmorchard/idea-town,lmorchard/testpilot,lmorchard/testpilot,flodolo/testpilot,meandavejustice/testpilot,fzzzy/testpilot,meandavejustice/testpilot,lmorchard/idea-town-server,fzzzy/testpilot,flodolo/testpilot,lmorchard/testpilot,mozilla/idea-town,flodolo/testpilot,lmorchard/idea-town,mozilla/idea-town-server,meandavejustice/testpilot,meandavejustice/testpilot,mozilla/idea-town-server,mozilla/idea-town,lmorchard/idea-town-server,mozilla/idea-town-server,lmorchard/idea-town-server,lmorchard/idea-town-server,chuckharmston/testpilot,mozilla/idea-town,chuckharmston/testpilot,lmorchard/testpilot,flodolo/testpilot,fzzzy/testpilot,lmorchard/idea-town,chuckharmston/testpilot,fzzzy/testpilot