Error when run `Lspsaga lsp_finder without save the file first

[nshen]

Error when run <cmd>Lspsaga lsp_finder<CR> without save the file first.

E5108: Error executing lua .../pack/packer/start/lspsaga.nvim/lua/lspsaga/provider.lua:408: Vim(ed
it):E37: No write since last change (add ! to override)
stack traceback:
        [C]: in function 'nvim_command'
        .../pack/packer/start/lspsaga.nvim/lua/lspsaga/provider.lua:408: in function 'open_link'
        .../pack/packer/start/lspsaga.nvim/lua/lspsaga/provider.lua:477: in function 'open_link'
        [string ":lua"]:1: in main chunk