Gov. Jim Gibbons was unavailable Thursday to comment on growing rumors his marriage is on the rocks. But he and his wife Dawn were reportedly planning to decide what to do about the situation this weekend.Dawn Gibbons was in Las Vegas and also unavailable for comment.The rumor has been the hot topic in Nevada political circles for several weeks. While media outlets and at least one Washington blogger are reporting divorce papers have been filed, a check of Nevada court clerks revealed no such filing.It was also unclear which one of the two was supposedly seeking the divorce.There have been …