Fix another case where ExceptT's lack of fail bites us
Fix another case where ExceptT's lack of fail bites us

chrisdotcode/hackage-server,agrafix/hackage-server,ocharles/hackage-server,dzackgarza/hackage-server,tkvogt/hackage-server,erantapaa/hackage-server,ocharles/hackage-server,chrisdotcode/hackage-server,erantapaa/hackage-server,dzackgarza/hackage-server,tkvogt/hackage-server,edsko/hackage-server,edsko/hackage-server,agrafix/hackage-server