When you get a report like that it means that there is no troops occupying the valley, it doesn't have anything to do with you're informatics. You can't get resource information from valleys because rarely is a player dumb enough to hold resources in their valleys. Also depending on what level the city you're scouting in Town hall and beacon tower and # of scouts you may not get much info or anything at all because a level 10 town hall makes it hard to scout and a level 10 beacon tower alerts the army when a scout party is in progress and the scouts will fight off/try erase as much info from enemy scouts as possible.

P.S I believe this is in the wrong forum section, should of posted this in help & questions, though this information could prove useful to new players.