How to continue the map when an error come out?

nnoremap <leader>k :%s/\v^\s+//g<CR>:sort u<CR>:xa<CR>


This is my map. When there is no match to the "^\s+", an error will come out, and the map will pause, the sort u, and the xa will not be executed. So how to continue the map when there is an error come out?

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