How can the Pipistrel Apis land safely?
Many modern gliders only have one wheel -- two is a great luxury!

In a glider the wing and flight controls remain effective until the aircraft is almost completely stopped - with a little training and practice it's possible to balance on the one (or two) wheels right up to the point where you're nearly stopped, at which point the glider will gently tip onto one of its wings as it comes to a halt.  

As you've surmised the wingtip usually has some reinforcement or other provision (such as a skid plate or a small wheel) to prevent damage when it contacts the ground. The photo below is of one of these wingtip wheels.