I was away from my home for three months and when I returned, I noticed the water in the master toilet was gone. I flushed the toilet and the water completely ran out, although the tank emptied into the bowl. I then poured a bucket of water into the bowl, and it too drained completely out. I live in a first floor condo and none of my neighbors have had problems with their toilets, nor do I have a problem with the toilet in the guest bath. There is no water running onto the floor and I do not have any sewer odors in the bathroom. Does anyone know why the bowl will not hold water, as it worked fine before I left?