allow creation of fresh children db on init

cmd/allowances/main.go

@@ -92,11 +92,9 @@ func main() {
 		case "add":
 			dbfile := os.Args[3]
 			names := os.Args[4:]
-			db, err := children.Load(dbfile)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "problem loading children db: %s\n", pwUsage)
-				os.Exit(1)
-			}
+
+			// ignore if file wasn't there to begin with
+			db, _ := children.Load(dbfile)
 			for _, name := range names {
 				db[name] = 0
 			}