Dont display empty match groups

tools/tui/readline/completion.go

@@ -258,6 +258,9 @@ func (self *Readline) completion_screen_lines() ([]string, bool) {
 	}
 	lines := make([]string, 0, self.completions.current.num_of_matches)
 	for _, g := range self.completions.current.results.Groups {
+		if len(g.Matches) == 0 {
+			continue
+		}
 		if g.Title != "" {
 			lines = append(lines, self.fmt_ctx.Title(g.Title))
 		}