It was mere hours before No Doubt kicked off their residency at Las Vegas’ Sphere when the emotional weight of the moment struck bassist Tony Kanal. “I had a good cry at soundcheck,” he tells Variety of their Wednesday night performance, the first of 18 shows at the state-of-the-art venue through the end of May. “I’m glad I got that out of the way before the show, because I would have probably started losing it on stage.” Along with his bandmates — lead singer Gwen Stefani, guitarist Tom Dumont and drummer Adrian Young, plus longtime horn/keyboard players Stephen Bradley and Gabrial McNair — Kanal brought the group’s vision to life across the two-hour show, a retrospective that traces No Doubt ‘s scrappy early years to its rise as a global phenomenon.…