But it's not a negative result; it's a failure to perform
A null detection of theoretically predicted gravitational waves would be great science, prompting a revision of our attempted understanding of physical laws. In marked contrast, LIGO simply doe not work as planned. Years after its commisioning, LIGO fails to reach the relatively noise free sensitivity levels required to detect the predicted gravitational waves it was built to detect. Blew its specs. Like the X-33 hangar queen billion dollar fiasco, all we've learned is that the claims of the funding proponents were not at all accurate.