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Problem: gq (and other filters) on an empty buffer fail with
"E20: Mark not set": when the filter produces no output,
do_filter() still subtracts the line count from '[ and '],
pushing '] to line 0.
Solution: when the filter produces no output, put '[ and '] on a valid
line instead of subtracting past line 1 (glepnir).
related: neovim/neovim#30593
closes: vim/vim#19061
aefbca2977