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E.g., passing an empty group name to the sign argument linehl (e.g., "linehl=") causes the following error: ``` Error detected while processing /usr/home/0mp/.vim/plugged/vim-gitgutter/plugin/gitgutter.vim[96]..function gitgutter#highlight#define_signs[10]..<SNR>56_define_sign_line_highlights: line 9: E1249: Group name missing for linehl ``` This patch makes the those errors go away by passing "None" when no group name is needed.