LOS ANGELES (Reuters) – "Dexter" star Michael C. Hall has always been attracted to cutting-edge projects, so it's no surprise to see the actor who plays the blood spatter analyst/serial killer pop up in the edgy, dark comedy Web series "Ruth & Erica". Starring "ER's" Maura Tierney as a lonely middle-aged woman trying to deal with her increasingly frail parents, the 13-episode show debuted on WIGS, YouTube's No. 1 channel for scripted drama, last month. …