patch 8.0.1422: no fallback to underline when undercurl is not set commit https://github.com/vim/vim/commit/45a0000d5c4a5ea934d5a16a2ab5bbcf307623ac Author: Bram Moolenaar <Bram@vim.org> Date: Fri Dec 22 21:12:34 2017 +0100 patch 8.0.1422: no fallback to underline when undercurl is not set Problem: No fallback to underline when undercurl is not set. (Ben Jackson) Solution: Check for the value to be empty instead of NULL. (closes https://github.com/vim/vim/issues/2424)

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