Suggestion: It would be better to show a message instead of open the window when no item matched by gtags/rg

[xaljer]

Like --auto-jump do a special treatment for match number is 1, match number is 0 also need a special treatment. I think showing a message is better than opening a window with nothing, which can avoid to press q to quit the window. It could be a default behave. It also helps to add fallback operation when Leaderf can't give results, may be?