Can't remove App Store update tied to an old deleted user account (for an app that's also no longer installed)
I inherited a Macbook Pro at work from an old employee that no longer works for the company. It was since upgraded to Mountain Lion and only has one user account for me. However, the App Store keeps showing an update badge for an application installed by the previous user that no longer has an account on this computer. When selecting update it says to log into a specific email address of the previous user, but their account no longer exists on the computer--just my account and Apple ID.
I also can't even find the app on the Macbook either using a Spotlight search. So I can't even remove the app to rid this issue as well.
I tried to contact Mac App Store Support and I keep getting misdirected to someone in iTunes support who tells me they can't help me and refers me in circles back here.
MacBook Pro, OS X Mountain Lion (10.8.2)