Actor Jesse Williams and his ex-wife Aryn Drake-Lee are gearing up for another lengthy court battle over custody — due to the two being unable to reach a settlement behind closed doors. According to court documents obtained by Radar, the former Grey’s Anatomy star and his real estate broker/holistic entrepreneur ex had their lawyers appear in court on February 16. The filing notes the exes were unable to come to terms on any issue. The judge had instructed the parties to appear for mediation in an attempt to avoid further court hearings and/or a potential trial on the matter. As Radar first re…