Here's the good news about the Next Act Theatre production of "Vigil" that opened last weekend. The ageless Ruth Schudson follows up her crisply precise and on-the-mark work in the Milwaukee Chamber Theatre's revival of "Driving Miss Daisy" with an equally impressive but very different performance. The sum total of the lines she speaks could be written on one side of a 4x6 index card, but she is continually expressing herself with unmistakable clarity.