Designer 35RLTS and Jayco Talk...Thanks Frank!!

Forgive me if this has been addressed before. We've been having some water build-up in the refrigerator tray. It usually occured when we moved. No big deal. Lately, it's been happening a lot while we're parked. So, I did some looking around here on RV.Net and found the suggestion that the drainage hose might be blocked. Guess what? Ours was plugged shut (with a plug!) Two years and who knew?
You don't suppose the plug is supposed to be there?