Issue #3118087 by dww, JoshaHubbers, jungle, tedbow, RajabNatshah, Kingdutch,...

Issue #3118087 by dww, JoshaHubbers, jungle, tedbow, RajabNatshah, Kingdutch, JonMcL, xjm, Nick Hope, wroehrig, wxman, broeker, mlozano7, kazajhodo, suit4, xmacinfo, BrightBold: If any extension has a missing or invalid version, Update manager throws errors and is confused about site update status