Defauling --actors-update to 1900-01-01

src/argv.js

@@ -5,6 +5,10 @@ const yargs = require('yargs');
 const moment = require('moment');
 
 function interpretAfter(after) {
+	if (!after) {
+		return new Date(0, 0, 0);
+	}
+
 	if (/\d{2,4}-\d{2}-\d{2,4}/.test(after)) {
 		// using date
 		return moment