Make sure CourseDateUtils.isDateValid() returns a boolean
Make sure CourseDateUtils.isDateValid() returns a boolean

This was returning undefined rather than true. Fixes the broken javascript test.

KarmaHater/WikiEduDashboard,sejalkhatri/WikiEduDashboard,MusikAnimal/WikiEduDashboard,Wowu/WikiEduDashboard,majakomel/WikiEduDashboard,majakomel/WikiEduDashboard,sejalkhatri/WikiEduDashboard,sejalkhatri/WikiEduDashboard,KarmaHater/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,feelfreelinux/WikiEduDashboard,sejalkhatri/WikiEduDashboard,Wowu/WikiEduDashboard,Wowu/WikiEduDashboard,majakomel/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,MusikAnimal/WikiEduDashboard,alpha721/WikiEduDashboard,feelfreelinux/WikiEduDashboard,alpha721/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,feelfreelinux/WikiEduDashboard,sejalkhatri/WikiEduDashboard,alpha721/WikiEduDashboard,alpha721/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,KarmaHater/WikiEduDashboard,KarmaHater/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,majakomel/WikiEduDashboard,Wowu/WikiEduDashboard,feelfreelinux/WikiEduDashboard,MusikAnimal/WikiEduDashboard,MusikAnimal/WikiEduDashboard