fixed regression in insights tab (filter out null classes)
fixed regression in insights tab (filter out null classes)

jmptrader/TouchDevelop,jle33/TouchDevelop,sedouard/TouchDevelop,CodeKingdomsTeam/TouchDevelop,ntoll/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,MetSystem/TouchDevelop,CodeKingdomsTeam/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,ntoll/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,jle33/TouchDevelop,Aksoom-Hussain/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,sedouard/TouchDevelop,Aksoom-Hussain/TouchDevelop,UIKit0/TouchDevelop,MetSystem/TouchDevelop,UIKit0/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,jle33/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,jle33/TouchDevelop,CodeKingdomsTeam/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,UIKit0/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,CodeKingdomsTeam/TouchDevelop,jmptrader/TouchDevelop,jmptrader/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,jmptrader/TouchDevelop,sedouard/TouchDevelop,MetSystem/TouchDevelop,jle33/TouchDevelop,ntoll/TouchDevelop,Aksoom-Hussain/TouchDevelop