Fix issue where session can be acivated without reqs
Disables the activate session button when there are no requirements.
Merge branch 'dev-fix-noReqsSessionBug' into dev

Conflicts:
	PlanningPoker/src/edu/wpi/cs/wpisuitetcw/modules/planningpoker/view/overviews/viewSessionComp/ViewSessionBtnPanel.java