fix: #1457

closes #1458

Author: lewis6991

lua/gitsigns/git/blame.lua

@@ -239,6 +239,8 @@ function M.run_blame(obj, contents, lnum, revision, opts)
     return ret, {}
   end
 
+  --- @type Gitsigns.BlameOpts
+  --- EmmyLuaLs/emmylua-analyzer-rust#921
   opts = opts or {}
 
   local ignore_file = obj.repo.toplevel .. '/.git-blame-ignore-revs'
@@ -261,7 +263,7 @@ function M.run_blame(obj, contents, lnum, revision, opts)
       'blame',
       '--incremental',
       contents and { '--contents', '-' },
-      opts.ignore_whitespace and '-w',
+      opts.ignore_whitespace and '-w' or nil,
       lnum and { '-L', type(lnum) == 'table' and (lnum[1] .. ',' .. lnum[2]) or (lnum .. ',+1') },
       opts.extra_opts,
       uv.fs_stat(ignore_file) and { '--ignore-revs-file', ignore_file },

lua/gitsigns/util.lua

@@ -456,10 +456,10 @@ function M.flatten(x)
       vim.list_extend(ret, M.flatten(v))
     elseif type(v) == 'string' then
       ret[#ret + 1] = v
-    elseif v == nil then
+    elseif not v then
       -- skip
     else
-      error('Expected string or table, got ' .. type(v))
+      error('Expected string, table, false or nil, got ' .. type(v))
     end
   end
   return ret