Since dance critic Octavio Roca left the San Francisco Chronicle a few months ago, the newspaper hasn’t had a staff dance critic. And it currently has no plans to hire one. This week one of the freelancers who’s been helping fill the beat raised an alarm on an online dance BB that the Chron was eliminating dance coverage altogether. Not so, writes Chron editor David Wiegand: We have no intention of cutting dance coverage. But “since Octavio left, I have received all of two letters about the fact we haven’t yet been authorized by the Hearst Corp. to hire a new dance critic. That’s rather sad, don’t you think?” Sounds like an invitation to me…