Fix undefined message when there are 0 hours in time tracking
Fix undefined message when there are 0 hours in time tracking

codeforeurope/samenspel,teambox/teambox,rahouldatta/teambox,vveliev/teambox,crewmate/crewmate,alx/teambox,codeforeurope/samenspel,nfredrik/teambox,teambox/teambox,vveliev/teambox,irfanah/teambox,irfanah/teambox,vveliev/teambox,nfredrik/teambox,rahouldatta/teambox,nfredrik/teambox,ccarruitero/teambox,nfredrik/teambox,crewmate/crewmate,wesbillman/projects,rahouldatta/teambox,teambox/teambox,irfanah/teambox,irfanah/teambox,crewmate/crewmate,alx/teambox,vveliev/teambox,wesbillman/projects,ccarruitero/teambox