Steps to reproduce the issue

Open the Atum template style and delete the values for each of the inputs in the colour tab and then save

Expected result

The style is saved and the default values from the xml are used. (this is how you get back to default after messing up your colours)

Actual result

Cannot save as there is a required field error. No field is displayed as required. No field is highlighted. checking the templatedetails.xml no field is set to be required there either

(this is tested with current 4.0dev branch)