[aardvark179]

There were lots of things people really were hoping to see from the LHC, and weren't seen. supersymmetry being one example. Not seeing those things is just as important to everyone involved as seeing them is, so although the theories may try to modify their theories to explain why nothing was seen at those energies, it isn't in any of the experimenters interests to pretend they observed something they didn't.

See also the number of experiments conducted to try and observe things like dark matter candidates with various properties. All those experiments are in competition to either show presence or absence, and absence is just as important because it's proving that you made an incredibly sensitive detector and have used that to show that a particular possibility really wasn't the right one.