spell: fix listing recent.

spell.go

@@ -54,6 +54,10 @@ var spell = &cli.Command{
 		if c.Args().Len() == 0 {
 			// check if we have input from stdin
 			for stdinEvent := range getJsonsOrBlank() {
+				if stdinEvent == "{}" {
+					break
+				}
+
 				var spell nostr.Event
 				if err := json.Unmarshal([]byte(stdinEvent), &spell); err != nil {
 					return fmt.Errorf("failed to parse spell event from stdin: %w", err)