Halle Berry has accused her ex-husband of refusing to attend co-parenting therapy. The ‘Union’ actress has failed in a bid to have a court to intervene in the agreement she has with Olivier Martinez – who she split from in 2015 after two years of marriage – over their nine-year-old son after alleging he hasn’t been attending sessions with the co-parenting coach to “resolve disputes and conflicts between them in an effort to successfully co-parent”. In a filing submitted to the Superior Court of California in Los Angeles County obtained by People magazine earlier this week, the 57-year-old star…