Until further notice, the A’s still view Bruce Maxwell as their No. 1 catcher in 2018. Maxwell pleaded not guilty Tuesday in Phoenix to assault charges after he allegedly waved a gun at a food-delivery person last month. Major League Baseball will investigate the matter, and Maxwell could be subject to discipline by MLB or the A’s. “I don’t want to talk about the off-field stuff right now. We’ll let the criminal proceedings play out,” general manager David Forst said at the GM meetings in Orlando. “But from a baseball standpoint, I expect Bruce to be our catcher next year.” Maxwell hit .237 with three homers and 22 RBIs in 76 games as a rookie and late in the season became the first big-leaguer to take a knee during the national anthem. Forst called Maxwell, a second-round pick in the 2012 draft, a good receiver and thrower who works well with pitchers and has displayed a potent bat at different stages in his pro career.