fix empty editor issue when no editor mode has been selected
fix empty editor issue when no editor mode has been selected

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