Please take a look at this KB article
for validation of empty subjects.
As you will see in the KB article you can just type :
'Please insert a subject!'
Please let me know if this was helpful.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!